Article updated 18:40, Friday 24/02/12
The 22-year-old midfielder was replaced by Paul Scholes an hour into United's 2-1 Europa League defeat to the Dutch champions. He made his return to action seven days earlier, in the first leg in Amsterdam, after almost four months out with a foot injury.
Sir Alex Ferguson told MUTV on Friday afternoon: "He got a knock. We sent him for a scan but we don't think it's serious."
As for the other team news ahead of Sunday's Barclays Premier League trip to Norwich City, the boss said: "There are no other injuries from last night.
"There was a little bit of tiredness for the players who needed a game, those who had been injured, like Tom Cleverley, Chris Smalling, Phil Jones and Ashley Young. It's good to get them all back but we took them to the limit in terms of the energy spent last night because it was quite a fast game."
Wayne Rooney missed Thursday's Ajax match due to a throat infection but the boss is hopeful his talismanic number ten could return at Carrow Road.
"Wayne was out running yesterday and we're doing our best to make sure he's ready for Sunday. We'll see what he's like tomorrow (Saturday)."