When play stopped Marriner jogged over towards the far touchline - meaning that cameras had to follow him all the way back to this side of the pitch. Just get the impression it's all orchestrated to give the officials as much limelight as possible - and an opportunity for viewers to see their...
"It’s a breather for Maty, who has played a lot of football over the last two or three years and I’m looking forward to seeing Rob," said Potter.
"Rob is a young goalkeeper with some fantastic attributes and we think he can help us in this game."
72 mins
SUBSTITUTIONS
Manchester United 0-0 Chelsea
Mason Mount and Tammy Abraham come on for Timo Werner and Kai Havertz. The YTS lads on for the £$£$£$£$£ imports.