ANTHONY MARTIAL headed straight down the Old Trafford after appearing to tweak his hamstring against Arsenal.
The Manchester United star had been chasing back into his own half when he pulled up, clutching his calf.
PA:Empics Sport3 Anthony Martial was subbed off after appearing to pick up a hamstring injury
Martial, 23, signalled to the bench and after a brief assessment he was replaced.
The French striker had equalised for the home side, taking advantage of slopping defending from a free-kick to slot home from close range.
It was his eighth goal of the season for United – scored on his 23rd birthday.
Jose Mourinho's team had found themselves trailing after a Marcos Rojo error was pounced upon by substitute Alexandre Lacazette.