The keeper was withdrawn just before the start of the game at Cambridge on Saturday after hurting his thigh.
Said Chris Coleman to the CT: "Keiran kicked the ball and his thigh in his standing leg just tensed up with pins and needles,so we said it was not even worth risking him.
"He is fine. He had the same problem a couple of seasons ago but he is fine.
"It was disappointing to lose him but we know that he is going be ok and on the plus side, Danny Ireland came in and did very,very well."