Arsenal's Theo Walcott injured again.

This time he is ruled out for 3-4 weeks after damaging knee ligaments.

The 20-year-old winger, who was previously stuck with a back injury, was substituted just 33 minutes into his first Arsenal start of the season.

He made a bright start against Birmingham but took a robust challenge by Liam Ridgewell and, though returning to the field, was soon substituted.