Arsenal manager Arsene Wenger says attacking midfielder Alexis Sanchez was fit to face Norwich City on Sunday afternoon.
On Thursday, the Frenchman revealed that the Chilean had a "little hamstring alarm" but still opted to deploy him only for the 26-year-old to suffer an apparent hamstring problem in the second half of the game.
Defender Laurent Koscielny and midfielder Santi Cazorla will also be assessed on Monday morning after picking a hip injury and a knee injury respectively.
"The players are there to play football and not to be rested when the press decides they need to be rested," Wenger told reporters.
"He [Alexis Sanchez] says it is a kick on his hamstring. I fear the reality is worse than that.
"Nobody is scientifically developed enough, not even the press, to predict exactly when a guy would be injured. I must say that with all humility we are not position to predict that, despite all our test he looked alright.
"We checked him [during the week] and when you have no force and no middle stretch in your hamstring then there is no problem and he had that.
"In the first half he [Santi Cazorla] got a kick on the knee and it got worse. I don't know if he has jaded his knee ligament or he it was just a kick on the nerve but the worrying thing was it got worse during the game.
"For [Laurent] Koscielny it was a kick on his hip and he could not move at all. We have to assess all of that."
