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Mathieu Flamini is out of tomorrow's Champions League clash with Borussia Dortmund.

Flamini trained normally this morning but has been ruled out by the five-day concussion rule imposed after his clash of heads with Norwich's Alex Tettey.

It is a blow for the Gunners but is likely to mean a recall to the starting line-up for in-form Aaron Ramsey who stepped off the bench to score in Saturday's 4-1 win over Norwich.

Arsenal boss Arsene Wenger confirmed that Flamini is fit, trained normally and has suffered no ill effects but they are bound by the medical rules.

Wenger said: “Flamini is doing well, but he is ruled out by the five day concussion rule. He will be fine for this weekend.”

Wenger, who celebrates his 64th birthday on Tuesday, believes Dortmund will be a huge test.

“We cannot hide,” said Wenger. “It should be an exciting game.”

Watch John Cross's video verdict following Arsenal's 4-1 win over Norwich here.