Arsenal could be without Santi Cazorla for the rest of the season after the Spain international suffered a reaction in his Achilles while undergoing rehabilitation from knee-ligament surgery.
Cazorla has not featured for Arsenal since rupturing his lateral collateral ligament during the 1-1 draw at Norwich City on November 29.
"Santi is not doing too well," Wenger said. "He has some Achilles problems that hold him back.
"His knee is doing well but his Achilles has inflamed a little bit and we have to put him off impact [training].
"It has been a reaction to coming back. A return in April? We have to see now how he responds.
"He always had a little tendinitis in his Achilles and we have to see how he responds to that."
"We feared surgery at some stage before we saw the MRI. In the end we got, on that front, positive news," he said.
He is still a month away from playing, meaning he will not be in contention for England's forthcoming friendlies against Germany and Netherlands
"Jack is doing quite well but has still not been outside yet, running," Wenger added. "He starts again, I think, this week. He will be three to four weeks [more] out."
