Arsenal's Yossi Benayoun (L), Ju Young Park (2nd L), Alex Oxlade-Chamberlain (2nd R) and Per Mertesacker attend a team training session in London Colney, north of London September 12, 2011. Arsenal are due to play Borussia Dortmund in a Champions League match in Dortmund on Tuesday. REUTERS/ Eddie Keogh (BRITAIN - Tags: SPORT SOCCER)