The Tottenham ace had to be withdrawn at half-time as the after-effects of a virus and a heavy challenge by Grant Hanley got the better of him.
Wales coach Chris Coleman said: “Some of their tackling was brutal. Unfortunately we had to bring Gareth off at half-time. He had a bang on the ankle which was sore to start with. But he’s OK.
“If we’d have lost tonight questions would have been asked of me again and my job."