Soccer Football - Europa League Semi Final Second Leg - Chelsea v Eintracht Frankfurt - Stamford Bridge, London, Britain - May 9, 2019 Chelsea assistant coach Gianfranco Zola talks with Michael Ballack pitchside before the match Action Images via Reuters/John Sibley

Soccer Football - The Best FIFA Football Awards - Royal Festival Hall, London, Britain - September 24, 2018 Sergio Ramos, Dani Alves, Marcelo, Luka Modric, N'Golo Kante, Eden Hazard, Kylian Mbappe, David De Gea and Raphael Varane after being named in the Fifa Fifpro World XI with Michael Ballack, Ronaldinho and Idris Elba Action Images via Reuters/John Sibley

Soccer Football - The Best FIFA Football Awards - Royal Festival Hall, London, Britain - September 24, 2018 Michael Ballack and Ronaldinho during the awards Action Images via Reuters/John Sibley

Soccer Football - The Best FIFA Football Awards - Royal Festival Hall, London, Britain - September 24, 2018 Michael Ballack before the start of the awards Action Images via Reuters/John Sibley

Basketball - NBA - Boston Celtics vs Philadelphia 76ers - O2 Arena, London, Britain - January 11, 2018 Former Germany footballer Michael Ballack before the game REUTERS/Matthew Childs

Basketball - NBA - Boston Celtics vs Philadelphia 76ers - O2 Arena, London, Britain - January 11, 2018 Former Germany footballer Michael Ballack before the game REUTERS/Matthew Childs

Britain Basketball - Denver Nuggets v Indiana Pacers - NBA Global Games London 2017 - The 02 Arena, London, England - 12/1/17 Former footballer Michael Ballack (L) and Arsenal's Per Mertesacker in the crowd Reuters / Matthew Childs Livepic EDITORIAL USE ONLY.

Britain Football Soccer - England v Germany - Legends International - Upton Park - 2/5/16
Germany's Michael Ballack
Action Images via Reuters / Tony O'Brien

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Britain Football Soccer - England v Germany - Legends International - Upton Park - 2/5/16
Germany's Michael Ballack and teammates celebrate with the trophy
Action Images via Reuters / Tony O'Brien
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Britain Football Soccer - England v Germany - Legends International - Upton Park - 2/5/16
Germany's Michael Ballack
Action Images via Reuters / Tony O'Brien
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Britain Football Soccer - England v Germany - Legends International - Upton Park - 2/5/16
Germany's Michael Ballack and England's Teddy Sheringham as referee Dermot Gallagher looks on
Action Images via Reuters / Tony O'Brien
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Britain Football Soccer - England v Germany - Legends International - Upton Park - 2/5/16
Germany's Michael Ballack and England's Darren Anderton
Action Images via Reuters / Tony O'Brien
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Britain Football Soccer - England v Germany - Legends International - Upton Park - 2/5/16
Germany's Michael Ballack poses for picture with fans
Action Images via Reuters / Tony O'Brien
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Golf - Alfred Dunhill Links Championship - St. Andrews, Scotland - 4/10/15
Former footballer Michael Ballack on the 4th during the final round
Mandatory Credit: Action Images / Jason Cairnduff
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Michael Ballack arrives with Natascha for the Bayern Munich Bundesliga Champions Dinner at Postpalast on May 23, 2015 in Munich, Germany. REUTERS/Alexander Hassenstein/Pool

Former Germany national team captain Michael Ballack receives flowers for his farewell, before Germany's World Cup qualifying soccer match against Austria in Munich September 6, 2013. REUTERS/Michael Dalder (GERMANY - Tags: SPORT SOCCER)

Former Germany national team captain Michael Ballack receives flowers from Philipp Lahm (L) for his farewell, before Germany's World Cup qualifying soccer match against Austria in Munich September 6, 2013. REUTERS/Michael Dalder (GERMANY - Tags: SPORT SOCCER)

Former German national soccer player Michael Ballack (4R) watches the 2014 World Cup Group C qualifying soccer match between Germany and Kazakhstan in Nuremberg March 26, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: SPORT SOCCER)

Former German soccer player Michael Ballack arrives at the red carpet ahead of the German sports press ball in Frankfurt, November 10, 2012. REUTERS/Lisi Niesner (GERMANY - Tags: ENTERTAINMENT SPORT)

Germany's Michael Ballack smiles during their "Match of the century", a charity soccer match between former soccer internationals from Germany and Italy, in Frankfurt, October 14, 2012. REUTERS/Kai Pfaffenbach (GERMANY - Tags: SPORT SOCCER)

Italy's Pietro Vierchowod (C) challenges Germany's Michael Ballack during their "Match of the century", a charity soccer match between former soccer internationals from Germany and Italy, in Frankfurt, October 14, 2012. REUTERS/Kai Pfaffenbach (GERMANY - Tags: SPORT SOCCER)

Germany's Lothar Matthaeus, Jens Lehmann, Christian Woerns, Guido Buchwald, Michael Ballack, Stefan Reuter (back row L-R), Pierre Littbarski, Olaf Thon, Ulf Kirsten, Thomas Haessler and Andreas Brehme (front row, L-R) pose for a team picture prior to their "Match of the century", a charity soccer match between former soccer internationals from Germany and Italy, in Frankfurt, October 14, 2012. REUTERS/Kai Pfaffenbach (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack arrives for their Champions League soccer match against FC Barcelona in Leverkusen February 14, 2012. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayern Munich President Uli Hoeness (R) talsk with Bayer Leverkusen soccer player Michael Ballack during his 60th birthday celebration at Postpalast in Munich January 13, 2012. Picture taken January 13. REUTERS/Alexander Hassenstein/Pool (GERMANY - Tags: ENTERTAINMENT SPORT SOCCER SOCIETY)

Bayern Munich President Uli Hoeness (R) welcomes Bayer Leverkusen soccer player Michael Ballack to his 60th birthday celebration at Postpalast in Munich January 13, 2012. Picture taken January 13. REUTERS/Alexandra Beier/Pool (GERMANY - Tags: ENTERTAINMENT SPORT SOCCER SOCIETY)

Formula One pilot Michael Schumacher and German soccer player Michael Ballack (L) drive in their car during of the Race of Champions (ROC) at the Esprit Arena in Duesseldorf December 4, 2011. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT MOTORSPORT)

Formula One pilot Michael Schumacher and German soccer player Michael Ballack (L) drive in their car during of the Race of Champions (ROC) at the Esprit Arena in Duesseldorf December 4, 2011. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT MOTORSPORT)

Chelsea goalkeeper Petr Cech (L) lets in a goal by Bayer Leverkusen's Manuel Friedrich (not pictured) in the last minute of the Champions League Group E soccer match in Leverkusen November 23, 2011. At centre is Michael Ballack of Leverkusen. Leverkusen won the match 2-1. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (L) and his coach Robin Dutt celebrate victory against Chelsea after the Champions League Group E soccer match in Leverkusen November 23, 2011. Leverkusen won the match 2-1. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Chelsea's goalkeeper Petr Cech makes a save in front of Michael Ballack of Bayer Leverkusen during their Champions League Group E soccer match in Leverkusen November 23, 2011. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER)

Referee Viktor Kassai reacts to Bayer Leverkusen's Michael Ballack (L) during the Champions League Group E soccer match against Chelsea in Leverkusen November 23, 2011. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack and Chelsea's Branislav Ivanovic (R) head the ball during the Champions League Group E soccer match in Leverkusen November 23, 2011. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (2nd L) and Chelsea's Branislav Ivanovic (C) head a ball during the Champions League Group E soccer match in Leverkusen November 23, 2011. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's coach Robin Dutt watches Michael Ballack (R) during a training session in Leverkusen November 22, 2011. Bayer Leverkusen play Chelsea in their group stage Champions League soccer match on Wednesday. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack trains in Leverkusen November 22, 2011. Bayer Leverkusen play Chelsea in their group stage Champions League soccer match on Wednesday. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack trains in Leverkusen November 22, 2011. Bayer Leverkusen play Chelsea in their group stage Champions League soccer match on Wednesday. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack trains in Leverkusen November 22, 2011. Bayer Leverkusen play Chelsea in their group stage Champions League soccer match on Wednesday. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack trains in Leverkusen November 22, 2011. Bayer Leverkusen play Chelsea in their group stage Champions League soccer match on Wednesday. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack applauds to supporters after losing their Champions League Group E soccer match against Valencia at Mestalla stadium in Valencia November 1, 2011. REUTERS/Albert Gea (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack looks on while wearing a mask during their Champions League Group E soccer match against Valencia at Mestalla stadium in Valencia November 1, 2011. REUTERS/Albert Gea (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (L) and Valencia's Roderto Soldado fight for the ball during their Champions League Group E soccer match at Mestalla stadium in Valencia November 1, 2011. REUTERS/Albert Gea (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack adjusts his mask during their Champions League Group E soccer match against Valencia at Mestalla stadium in Valencia November 1, 2011. REUTERS/Albert Gea (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (L) and Valencia's Roberto Soldado fight for the ball during their Champions League Group E soccer match at Mestalla stadium in Valencia November 1, 2011. REUTERS/Albert Gea (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Stefan Kiessling (L) is congratulated by teammate Michael Ballack after scoring a goal against Valencia during their Champions League Group E soccer match at Mestalla stadium in Valencia November 1, 2011. REUTERS/Albert Gea (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (R) and Valencia's Jonas challenge for the ball during their Champions League Group E soccer match at Mestalla stadium in Valencia November 1, 2011. REUTERS/Heino Kalis (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (R) reacts beside teammate after Valencia's goal during their Champions League Group E soccer match at Mestalla stadium in Valencia November 1, 2011. REUTERS/Albert Gea (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (R) and Valencia's Jonas challenge for the ball during their Champions League Group E soccer match at Mestalla stadium in Valencia November 1, 2011. REUTERS/Heino Kalis (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (L) and Hanno Balitsch warm up during a training session at the Mestalla stadium in Valencia, October 31, 2011. Leverkusen will face Valencia in their Champions League Group E soccer match on Tuesday. REUTERS/Stringer (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack wears a mask during a training session at the Mestalla stadium in Valencia, October 31, 2011. Leverkusen will face Valencia in their Champions League Group E soccer match on Tuesday. REUTERS/Stringer (SPAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (L) is tackled by FC Valencia's Sergio Canales during their Champions League Group E soccer match in Leverkusen October 19, 2011. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack jumps during a team training session in Leverkusen October 18, 2011. Bayer Leverkusen will play Spain's FC Valencia in a Champions League Group E soccer match in Leverkusen. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (C) is seen during a team training session in Leverkusen October 18, 2011. Bayer Leverkusen will play Spain's FC Valencia in a Champions League Group E soccer match in Leverkusen. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack gives a thumb after the Champions League Group E soccer match against Genk in Leverkusen, September 28, 2011. Leverkusen won the match 2-0. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (R) celebrates a goal against Genk during the Champions League Group E soccer match in Leverkusen, September 28, 2011. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Simon Rolfes, Stefan Kiessling (R) and Michael Ballack (C) celebrate a goal against Genk during the Champions League Group E soccer match in Leverkusen, September 28, 2011. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (C) sits on the bench before their Champions League Group E soccer match against Genk in Leverkusen, September 28, 2011. REUTERS/ Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack sits on the bench before their Champions League Group E soccer match against Genk in Leverkusen, September 28, 2011. REUTERS/ Ina Fassbender (GERMANY - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack falls on his head during their Champions League Group E soccer match against Chelsea at Stamford Bridge in London September 13, 2011. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack reacts after a challenge during their group stage Champions League soccer match against Chelsea at Stamford Bridge in London September 13, 2011. REUTERS/Toby Melville (BRITAIN - Tags: SPORT SOCCER)

Bayer Leverkusen's Michael Ballack (top) challenges Chelsea's Jose Bosingwa during their Champions League Group E soccer match at Stamford Bridge in London September 13, 2011. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT SOCCER)