Edwin van der Sar has played down fears he suffered a recurrence of his groin injury during Manchester United's Champions League win at Chelsea.
The veteran Dutchman missed Saturday's win at West Ham as a precaution and twice back-up keeper Tomasz Kuszczak was sent to warm up amid fears Van der Sar was struggling at Stamford Bridge.
In the end, Nemanja Vidic started taking goal kicks, a decision that landed the 40-year-old with a yellow card as referee Alberto Undiano Mallenco viewed it as time wasting on Van der Sar's part.
However, the former Ajax man, United's shoot-out hero in the final against Chelsea three years ago, insists it is not a serious problem.
"When I dived to save a shot from Torres, I went 105% for my take-off," he revealed. "My calf gave way a little bit and I ended up with cramp.
"I didn't train a lot in the last couple of weeks, so maybe it was a bit of tiredness or something."