By Arsenal correspondent Tony Hughes

Arsenal suffered a triple injury blow in their 1-1 draw against Norwich on Sunday afternoon, Arsene Wenger revealed afterwards.

Alexis Sanchez and Laurent Koscielny were both substituted after sustaining hamstring and hip injuries respectively.

Speaking to Sky Sports afterwards, Wenger revealed that Santi Cazorla also suffered a knee problem in the second half but could not go off because the Gunners had already used their three substitutes,

“We have three [injuries] because Cazorla played on one leg for the final part of the second half and he has a knee problem, Sanchez has a hamstring problem and Koscielny has a hip problem” explained the Arsenal manager. “How bad it is, I do not know, we have to see that tomorrow.”

Sanchez’s injury comes after Wenger revealed at his pre-match media briefing on Friday that the Chilean was struggling with a hamstring problem going into the match.

Asked by Sky Sports on Sunday night if the amount of football Sanchez has played contributed to his injury, Wenger replied, “You could say that. At the moment on the striker front we have not much choice because [Danny] Welbeck is out, [Theo] Walcott is out, [Alex] Oxlade-Chamberlain is just coming back.

Red alert: Alexis Sanchez faces a spell on the sidelines after sustaining a hamstring injury

Red alert: Alexis Sanchez faces a spell on the sidelines after sustaining a hamstring injury

“Just because you repeat the games doesn’t mean you get injured, maybe the travelling to South America as well. I would have rested him today but he felt perfectly alright before the game and he declared that he had no problem.”

Of Arsenal’s 19 Premier League and Champions League matches this season, Sanchez has started 18 and been a second-half substitute in the other one, on the back of an exhausting programme over the last 18 months.

The 26-year-old played the full 90 minutes of last Tuesday’s 3-0 Champions League win over Dynamo Zagreb, scoring twice and setting up the opener for Mesut Ozil.