Manchester United finished the game against Southampton with 10 men after Brandon Williams was taken off due to a head injury.
Manchester United had made four of the permitted five substitutions before the injury but Ole Gunnar Solskjaer was unable to make a fifth substitution as he had made the four substitutions in the maximum three batches, so Eric Bailly was unable to come on for Williams.
Solskjaer suggested after the game that the Premier League should consider introducing a substitution for players who suffer a head injury during games.
“I don’t know if you look into those rules,” Solskjaer said of the Williams incident. “It was a bad cut, he (the referee) stopped the game when the Southampton centre-back got a calf injury and I didn’t understand that.
“We didn’t have too many minutes to see it out so we should have done better. It is what it is.”