Wenger also revealed Cesc Fabregas suffered a hamstring injury in the first half and will be assessed by the club tomorrow.

Walcott was bundled over by Dean Whitehead on the edge of the box in the 68th minute, but referee Peter Walton waved play on.

The 21-year-old stayed on the ground, clearly in pain, before being carried off on a stretcher to be replaced by Denilson.

Fabregas had earlier lasted just 14 minutes before being replaced by Andrey Arshavin.