By Chris Harris

Arsène Wenger cannot confirm the length of Abou Diaby’s lay-off until the inflammation on the midfielder’s ankle goes down.

The French international lasted just 11 minutes of Saturday’s 4-1 victory over Bolton thanks to a high challenge from Paul Robinson which forced the Arsenal substitute to be substituted in the second half.

Diaby will definitely miss Wednesday night’s Champions League opener with Braga and the Premier League trip to Sunderland on Saturday. Beyond that Wenger cannot be sure but he hopes for good news in the days to come.

"I'm vague [about the length of Diaby’s absence] because it's the ankle on which he had surgery,” said the manager.

“I was very anxious because he had a scan yesterday [Monday] and with Diaby there are always bad surprises on the scan. But the scan looks quite promising.

“We don't know how long he will be out as we don't know how long the inflammation will take to go down.”

According to Wenger, Diaby's temper was also inflamed on Saturday. The midfielder was seething with Robinson after the Bolton defender’s challenge and almost found himself in trouble as a result.

“He was angry. He could have been sent off for overreacting,” admitted Wenger.

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 14 Sep 2010