Everton boss Sam Allardyce does not know whether defender Eliaquim Mangala's knee injury will rule him out for the rest of the season.
The French centre-back, who joined the Toffees on loan from Manchester City last month, was forced off in the match against Crystal Palace on February 10.
Allardyce said at his Friday press conference: 'We're taking a second opinion on what we have to try and achieve.
'It's a very difficult thing to assess just how long it is going to take, whether it's going to be longer or not.