The Brazil international announced last month that he will leave the Reds when his contract expires at the end of this season, calling time on a four-year stint at Old Trafford.
He's been crucial throughout the current campaign, but particularly since Carrick came in – just a week prior to Case's departure announcement – with the head coach starting him alongside Kobbie Mainoo in all five of the games he's taken charge of so far.
In his meeting with journalists ahead of Monday night's clash, which incidentally falls on Casemiro's 34th birthday, Carrick discussed how important the Brazilian has been and why it's vital to have the right person in his role.