Speaking to Betfair, Shearer said: “They have to back Amorim. They've brought him in because it hasn't been anywhere near good enough and he needs to sort that mess out.
"He has to be able to do what he wants, and the situation with Marcus Rashford will be sorted out, whether it's sorted out in January, I guess for both parties will come to an agreement, but that's part of the process of who he wants to get out of the club and who he wants to bring in.
“Clearly, it isn't a healthy situation for the club, if Marcus doesn't want to be there and the manager doesn't want him there either. If that is the case, then it's best for both parties that something sooner rather than later is sorted out – that's easier said than done when you're on a huge contract.”