Maguire was booed by fans before and during Tuesday's 3-0 friendly win over the Ivory Coast at Wembley.
"I think when Roy Keane speaks we all sit up and listen. I think he's got huge gravitas in the game, for what he's achieved, for what he's done and everything he's gone through and achieved in the game.
"You do have to listen but he can be particularly vicious at times.
"No matter how he's played, if Roy Keane says he's had an absolute shocker and it's disgraceful and he's had a stinker we all go "well, he has done", even without watching the game ourselves and going through it.
"We listen because it's Roy Keane and he's spoken so without seeing it as ourselves we take his opinion as gospel. Maybe we shouldn't do that."
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