Laurent Koscielny and Alexis Sanchez left the field injured as Arsenal were held to a disappointing 1-1 draw at Norwich.
The afternoon had started well for the visitors after Mesut Ozil combined with Sanchez to open the scoring for the Gunners with 30 minutes on the clock but Arsenal were pegged back two minutes before half time when Lewis Grabban fired past Petr Cech.
Arsenal toiled for much of the second period but to little effect as they fell behind in the title race.
A bad day for Arsene Wenger was compounded by the loss to injury of Koscielny to a bad back and Sanchez to what appeared to be a hamstring strain.