Wenger on Walcott following the Ridgewell tackle.
"He has a bruised knee, it is swollen and difficult to assess at the moment. Is it a medial knee ligament that is twisted or just a kick? The fact that he says he felt a little unstable when he was running is not good news. We don't know yet how much of his pain is down to the kick and how much is down to the fact he twisted his ligament."
The knee instability is worrying. If it is a ligamentous injury then the AZ Alkmaar match is out and maybe more.
A note. Walcott's injuries have taken a worrying toll on his visibility. Whether it is his back or now his knee, it does not bode well for a player who seems to be on the cusp of a more significant career.