Everton midfielder Morgan Schneiderlin is a doubt for Sunday's game against Chelsea after injuring his thigh in training.
The £20million signing from Manchester United is due to have scans amid fears he may have a tear.
Everton had hoped to halt Chelsea's drive towards the Premier League title by maintaining their impressive record at Goodison Park but Schneiderlin's absence would represent a huge blow.
The 27-year-old France international has only been on the losing side once since joining Everton, coming in the 3-2 defeat at Chelsea's rivals Tottenham.