Manchester United midfielder Marouane Fellaini has reportedly suffered a setback in his return to fitness.
The Belgian international, who has been sidelined with wrist, back and groin problems since October, is believed to have picked up a hamstring strain in training last week.
He is now likely to miss United's trip to Arsenal in the Premier League on Wednesday, according to Goal.com.
Fellaini has scored one goal in 15 games for the Red Devils since joining from Everton at the start of the season.