Arsenal boss Arsene Wenger has confirmed that striker Lucas Perez will miss at least four weeks after suffering an ankle injury in mid-week.
Striker Olivier Giroud and midfielder Aaron Ramsey have finally recovered from their respective injuries and could feature this weekend against Sunderland at the Stadium of Light.
"From Tuesday night we've lost Lucas [Peres] for a while with an ankle injury," Wenger explained.
"I think he'll be out for six to eight weeks. It's very frustrating because he worked very hard to get there. Of course he is absolutely gutted, because it's an injury coming from nowhere, and a stupid one, because it was a deliberate kick.
"It's a similar tackle to [the one from Granit] Xhaka [against Swansea], but there was no red card. But the red card would not have helped Lucas. What is most important is that he's out for six to eight weeks.
"We have [Olivier] Giroud back available and Aaron Ramsey will be in the squad. They are available for selection. I have to be a bit cautious, especially with Aaron Ramsey, because he has not played at all yet. He has only had one week with the team so I will be a bit cautious with him.
"We have a few uncertainties over [Theo] Walcott, [Nacho] Monreal and [Santi] Cazorla, but they will all have tests today.
"No, he [Theo Walcott] is not ill. There is a slight hamstring alert, a very minor one. He will have a test today. He should be OK for Tuesday. If it's not tomorrow, it's OK for Tuesday."
