Arsenal midfielder Alex Oxlade-Chamberlain will be out for a "few weeks" with a knee injury, says boss Arsene Wenger.

The 22-year-old England international suffered the knock during Tuesday's Champions League last-16 tie.

"We lost Chamberlain on Tuesday. His injury is quite serious and keeps him out for a few weeks," said Wenger.

The French manager added that could mean "two or three weeks" or perhaps "six or seven" depending on the verdict of a specialist.