Michael Owen has picked up a new injury, but Sir Alex Ferguson insists the problem is not serious.
The striker had been hoping for a rare run-out in Manchester United's FA Cup fifth round clash with Crawley on Saturday.
Ferguson admits the 31-year-old was in his thoughts, with it important for the England man to get minutes under his belts.
Those plans have now been scrapped, though, as Owen has suffered a groin problem.
Reports had suggested that he was set for a lengthy spell on the sidelines, but Ferguson insists that is not the case.
He will not risk Owen in cup action over the weekend, but claims he could be in contention for midweek UEFA Champions League duty.
"Michael suffered a small injury during the week which will force him out tomorrow," said Ferguson.
"It is disappointing because I was going to play him but there is no point taking a risk and he could be available for the Marseille game on Wednesday."
Valencia and Evra
Another man who will be missing against Crawley is Antonio Valencia, but Ferguson insists the winger is closing in on full fitness.
The Ecuadorian has been sidelined since badly breaking his ankle in September, but is edging towards a first-team recall.
"Antonio has done a full week with the reserves doing non-contact work," said Ferguson.
"Everything is right about him. We would hope he would get into contact work with the reserves and join us by the end of next week."
Meanwhile, Ferguson has played down reports in France that full-back Patrice Evra has agreed a new four-year contract at Old Trafford.
He said: "There is nothing to report there at all."