Swansea City boss Michael Laudrup admits Ben Davies has a serious ankle injury after victory over Sunderland.
Laudrup confirmed the Wales international will undergo an X-ray to determine the severity of the damage.
He said: "It's another ankle injury, we have already had a few.
"It is a twisted ankle, he fell in the first half so we agreed to let him start the second half but after two or three minutes you could see it wasn't good.
"He will probably go for an X-ray, but I am not a doctor and we have to wait for the X-ray. But I think he may be out for the next two games (against Kuban Krasnodar and West Ham) at least."
