He told the club's website: "There's no real guide to follow when it comes to the recovery.
"I don't want to set a timeline but I want to get back as soon as possible and I'm optimistic I can do that."
The Irishman suffered the injury while training with his team-mates in Holland last week but thought he only had a dead leg.
The extent of the problem was diagnosed quickly and now the defender is on the road to recovery.
"There's no fitness work I can do. I've got to get my strength back first and go from there," he said.
"The surgeon assured me that as they had operated within a few hours of the problem, there should be nothing to worry about in relation to a reaction."
Source: BBC Sport
Source: BBC Sport