It has not been decided when the young Manchester United defender will have surgery but Evans knows he cannot carry on playing with pain-killers forever.
"At some point my ankle will need surgery," said the 22-year-old. "It is a problem that has been bothering me since Christmas. We thought it might have gone away over the summer but it is still there."
He added: "Every now and again I catch it and it will be quite sore for a while. Then the pain dies off after a week or so."
As a short-term measure, the anaesthetic seems to be working.
The Northern Ireland star was able to get through 34 games last season - including the Carling Cup final - and the first two this year when Rio Ferdinand and Nemanja Vidic have been out injured.
However, the return of Vidic after he suffered a calf injury prior to a pre-season game in Munich, plus the availability of Wes Brown, means the Belfast-born defender may not be required against Wigan at the DW Stadium on Saturday.
Ferdinand is out, though, with Evans acknowledging the 30-year-old's absence for another four weeks is a major blow.
"Rio is a good leader, a very good defender and a great player," he said. "He is a big character who brings a lot to the team when he is playing."