It was reported that Mertesacker had sustained a black eye following a training ground bust-up with young striker Yaya Sanogo. Arsenal played down the clash, saying it was the kind of incident that happens throughout a season. The 21-year-old was not punished by the club.

Arsenal, who were knocked off the top of the Premier League table, now face a crucial sequence of matches starting with Wednesday’s home fixture against Manchester United.

“It raises questions we have to answer on Wednesday night,” Wenger said.

“It is how we respond that matters.”

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