Aston Villa keeper Thomas Sorensen is set to miss the first game of the Premier League season on 11 August because of a hamstring problem.
Sorensen is battling with Stuart Taylor for superiority at Villa
Sorensen, 31, was injured against Toronto and is expected to need three to four weeks to recover.
"That would almost certainly rule me out of the game against Liverpool on the opening day but I hope I will be fit around a week after that," he said.
"I want to underline my position so this is the last thing I need."
Sorensen is in the final year of his current contract and has not been offered a new deal by Villa manager Martin O'Neill.
The Denmark international added: "This is the first time I have sustained this sort of injury. I placed the ball to take a goal kick and just felt my left hamstring go.
"I don't really know what caused it. Perhaps the fact the ball was very hard, that we were playing on synthetic turf, may have contributed.
"I really feared the worst at first but the physio is happy with my progress and I may need three to four weeks out."