Manchester United midfielder Phil Jones is a doubt for the first leg of the Champions League last 16 tie against Real Madrid on Wednesday after injuring his calf against Everton.
Jones, who was superb in shackling Everton dangerman Marouane Fellaini during Sunday's 2-0 victory, will be central to manager Sir Alex Ferguson's plans for the Bernabeu clash.
However, he limped off early in the second half and Ferguson said they did not yet know the full extent of the problem.
"He got a kick in the calf and we'll have to monitor it," Ferguson told the club's website.
Central defender Jonny Evans also had to come off suffering with cramp but should be available for the Madrid match.
"I think he's just lacked a couple of games," Ferguson said.
"He only had 45 minutes for Northern Ireland in midweek. He had to travel to Malta for that. We'll see what he's like [Monday].
Real Madrid and Jose Mourinho will part company at the end of the current season
Manchester City midfielder called up to the England squad for summer friendlies
Spurs miss out on Champions League again despite highest Premier League points tally
Champions closer to matching Real Madrid's La Liga record of 100 points with 2-1 win
Ten years on, the legends speak to FFT
Your questions answered by an A to Z of legends
He's here, he's there, he's...
The cost of Premier League away travel
Nike CR7 IX for you
FourFourTwo is brought to you by Haymarket Consumer Media & FourFourTwo is part of Haymarket Sport
| International Licensing | © Haymarket Media Group 2010