Manchester United could be without Jesse Lingard and Anthony Martial after both were injured in the Champions League defeat against Paris Saint-Germain.
Lingard pulled up shortly before half-time in the first leg of the last 16 tie at Old Trafford with what appeared to be a hamstring injury.
He played on after receiving treatment but was replaced by Alexis Sanchez during first-half stoppage time.
Martial was injured earlier in the game and played on until the interval but did not reappear for the second half. His place was taken by Juan Mata.
The game was goalless at the time but United lost 2-0 in what was Ole Gunnar Solskjaer's first defeat as United's caretaker manager.
Speaking after the game, Solskjaer said it was too early to say how long the pair would be out: "You don't know, muscular injuries - hamstring, groin, so we'll have to have a couple of days to assess them."
The two injuries will be a worry to Solskjaer with a crucial run of games coming up in the next few weeks.
Live Renault Super Sunday
United travel to Chelsea in the FA Cup fifth round next Monday before hosting Liverpool in the Premier League on February 24 live on Sky Sports.
Games against Crystal Palace and Southampton follow before the away leg against Paris Saint-Germain on March 6.
United then face back-to-back games away at Arsenal and home to Manchester City, both live on Sky Sports.