Arsenal manager Arsene Wenger's injury problems worsened on Sunday when Alexis Sanchez and Laurent Koscielny limped off during their side's 1-1 Premier League draw at Norwich City.

Centre-back Koscielny went off clutching his hip in the early stages, while Sanchez, who set up Mesut Ozil for Arsenal's goal, departed with around half an hour remaining after hurting his right hamstring.

Wenger had decided to field Sanchez despite the Chile forward having complained of a tight hamstring following Arsenal's 3-0 Champions League win over Dinamo Zagreb on Tuesday, in which he scored twice.

Asked if he may have erred in starting with Sanchez, Wenger told Sky Sports: "You can say that, but at the moment on the striker front we have not much choice because (Theo) Walcott is out, (Danny) Welbeck is out.

"I would have rested him today, but he felt perfectly alright before the game. He declared that he had no problem."

Sanchez scored 25 goals for Arsenal last season -- his first at the club after signing from Barcelona -- and his absence would be keenly felt, particularly as Wenger already has several players unavailable.

Aaron Ramsey and Alex Oxlade-Chamberlain returned from hamstring injuries at Carrow Road, but Jack Wilshere, Mikel Arteta, Theo Walcott, Francis Coquelin, Danny Welbeck and Tomas Rosicky are all currently sidelined.

Compounding Arsenal's injury problems, Wenger revealed that midfielder Santi Cazorla had also sustained a leg injury during the game.

"We have three (injuries) because Cazorla played on one leg in the final part of the second half," the Frenchman said.

"He has a knee problem, Sanchez has a hamstring problem and Koscielny has a hip problem. How bad it is, we'll have to see that tomorrow (Monday)."

The draw left Arsenal two points below league leaders Manchester City in fourth place.