Arsenal manager Arsene Wenger lamented a knee injury to Theo Walcott which overshadowed the 3-1 Barclays Premier League win against Birmingham.
The England forward was making his first start of the season for the Gunners, having been sidelined since August because of a back problem. However, following a strong, sliding challenge by Blues defender Liam Ridgewell, Walcott eventually hobbled out of the action just after the half-hour.
"It was a tackle which cut through, without any restriction. I felt it was a tackle meant to impress," said Wenger.
"I do not know whether he wanted to play the ball. If he touched just the ball, then that is part of the game.
"That is my first impression from the bench, but I would have to see it again."
Walcott will undergo a scan to assess the damage, which could now signal another spell on the sidelines for the World Cup hopeful.
"It is difficult to assess at the moment, whether it is a ligament which is twisted or just a kick," said Wenger.
"The fact he says he felt a little unstable when he was running is not good.
"We will scan him Sunday. If he has just a kick, then he has a chance to play on Tuesday (away to AZ Alkmaar).
"But I believe he will not be available. It is not a cruciate problem, but it could be more than a week."
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