Passengers, some wearing masks, travel on the London Underground train system, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, October 20, 2021. REUTERS/Toby Melville

Passengers, some wearing masks, travel on the London Underground train system, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, October 20, 2021. REUTERS/Toby Melville

Passengers wear masks whilst travelling on the London Underground train system, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, October 20, 2021. REUTERS/Toby Melville

Passengers wear masks whilst travelling on the London Underground train system, amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain October 20, 2021. REUTERS/Toby Melville

A stop sign is pictured in front of a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

A worker carries out repairs of a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

A passenger train used on the TGV Atlantique line of the SNCF network sits at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

An employee walks towards a passenger train used on the TGV Atlantique line of the SNCF network sitting at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

A worker carries out repairs of a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

An employee walks towards a passenger train used on the TGV Atlantique line of the SNCF network sitting at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

Employees perform refit and maintenance work on a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

Employees perform refit and maintenance work on a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

An employee performs refit and maintenance work on a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

An employee walks towards a passenger train used on the TGV Atlantique line of the SNCF network sitting at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

Employees perform refit and maintenance work on a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

A worker carries out repairs of a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

A worker carries out repairs of a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

Employees perform refit and maintenance work on a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

An employee walks towards a passenger train used on the TGV Atlantique line of the SNCF network sitting at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

An employee performs refit and maintenance work on a passenger train used on the TGV Atlantique line of the SNCF network, at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

A passenger train used on the TGV Atlantique line of the SNCF network sits at the Technicentre workshop in Rennes, France, October 20, 2021. REUTERS/Benoit Tessier

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United manager David Moyes during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Craig Dawson with Michail Antonio during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Craig Dawson with Michail Antonio during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Andriy Yarmolenko during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Ben Johnson during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Ben Johnson during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Manuel Lanzini during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Manuel Lanzini, Tomas Soucek and Craig Dawson during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Mark Noble during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Jarrod Bowen during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United manager David Moyes during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Tomas Soucek during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Tomas Soucek during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Tomas Soucek during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United manager David Moyes during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Kurt Zouma during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Manuel Lanzini during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Craig Dawson during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United manager David Moyes during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Kurt Zouma with teammates during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United's Craig Dawson during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Europa League - West Ham United Training - Rush Green Training Centre, Romford, Britain - October 20, 2021 West Ham United manager David Moyes during training Action Images via Reuters/Andrew Couldridge

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF coach Jon Dahl Tomasson during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF's Markus Bjorkqvist during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF's Martin Olsson during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF coach Jon Dahl Tomasson during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF coach Jon Dahl Tomasson and assistant coach Remy Reijnierse during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF's Anders Christiansen during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF coach Jon Dahl Tomasson during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF's Veljko Birmancevic during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF's Eric Larsson during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF's Eric Larsson during training Action Images via Reuters/Matthew Childs

Soccer Football - Champions League - Malmo FF Training - Stamford Bridge, London, Britain - October 19, 2021 Malmo FF's Adi Nalic during training Action Images via Reuters/Matthew Childs

Soccer Football - Women’s World Cup Qualifier - England Training - St George's Park, Burton upon Trent, Britain - October 19, 2021 England's Alex Greenwood with Fran Kirby during training Action Images via Reuters/Molly Darlington

Soccer Football - Women’s World Cup Qualifier - England Training - St George's Park, Burton upon Trent, Britain - October 19, 2021 England's Ellen White during training Action Images via Reuters/Molly Darlington

Soccer Football - Women’s World Cup Qualifier - England Training - St George's Park, Burton upon Trent, Britain - October 19, 2021 FA director of women's football Sue Campbell after training Action Images via Reuters/Molly Darlington

Soccer Football - Women’s World Cup Qualifier - England Training - St George's Park, Burton upon Trent, Britain - October 19, 2021 England's Georgia Stanway during training Action Images via Reuters/Molly Darlington

Soccer Football - Women’s World Cup Qualifier - England Training - St George's Park, Burton upon Trent, Britain - October 19, 2021 England's Leah Williamson with Ellen White during training Action Images via Reuters/Molly Darlington

Soccer Football - Women’s World Cup Qualifier - England Training - St George's Park, Burton upon Trent, Britain - October 19, 2021 England's Leah Williamson with Mille Bright during training Action Images via Reuters/Molly Darlington