Moyes chose to send on Joao Mario, Chicharito and Arthur Masuaku with the game beyond recall at 1-4.
As reported here earlier, TV streams had shown AC throwing his eyes heavenward and puffing out his cheeks in obvious anger and frustration.
He may well have been remembering his vital equaliser against Stoke City and wondering why he should be left on the bench whilst watching Manu Lanzini was among those coming off.
Interviewed and told of the allegation that Carroll had walked away from the bench Moyes insisted he would deal with the matter if that turned out to be the case.
He said: “You need everybody to be behind the team and if that is what has happened I will be dealing with it.”