Speaking on his Rio Ferdinand Presents podcast, the former defender said: "If I was that player that the manager said that about, my heart, my pride, my ego - embarrassment. For someone to question your application, to question (whether) you’re going out there and giving 100 per cent for your team, (suggesting) that you’re going to slack off and you’re taking shortcuts.
"We all have days off or moments when we’re not performing well, lacking confidence, but effort isn’t really one of the things I would want to be hearing a manager say is lacking in my makeup. That’s a damning comment because I think he knows what the reaction is after that comment."
He added: "He’s not saying that without thinking, ‘Where does this go after?’ There’s really no way back for Marcus after that, I don’t think, with that type of comment."