Arsenal star Laurent Koscielny (right) was injured in the defeat to Bayern Munich
Arsenal lost 5-1 to Bayern Munich, with four goals coming after Koscielny had hobbled off the field.
It is not known the extent of the damage done to his knee but he will likely be out of Monday’s FA Cup clash with Sutton United.
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And manager Arsene Wenger confirmed the Frenchman will have tests on his fresh injury.
Of the game, he said: “We lost Koscielny after that and I feel that we lost our structure and organisation and we were a bit a little naive on the goals we conceded.”
Arsenal face non-league Sutton on Monday seeking to progress to the FA Cup quarter-finals for the fourth successive year.
Koscielny came off when the scores were locked at 1-1 in Munich
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Arsene Wenger's Arsenal side face Sutton United on Monday
And Wenger says he will give some of the Gunners’ young players a chance to prove themselves.
“It’s a normal team,” he said.
“I gave (young players) a chance because they deserved to play (in the last round).
“They have done well and one or two might have another opportunity.”