Gray said: "I'll be taking no action against Mark.
"That situation developed last week when I was not there. It's a clean slate as far as I'm concerned.
"I shall also make it perfectly clear to him what I expect from him in the future and what I want him to do is get goals again for this club, because that is what he is good at.
"It's my job to make sure he plays at his best because that's what we need from him in our situation."