McGurk returned to score the equaliser in Saturday's 1-1 draw with npower League One promotion-chasers Huddersfield following a fortnight on the sidelines with a hamstring strain.
However, the 23-year-old later hobbled out of the action having sustained an ankle injury and Parry is expecting him to be out of action over the coming weeks.
"Adam turned his ankle," he told Tranmere Player. "He pulled out of a tackle and when he landed he went over on it.
"He was in a lot of discomfort. We like to let these things settle down, but if it's as bad as it looks he's going to be out for weeks."
In better news for Rovers, forward duo Enoch Showunmi and Andy Robinson have resumed light training following time out with leg and knee problems.