The Northern Irishman makes his first visit to United with Sunderland on Saturday.
‚ÄúThere was a question to him last week which was absolutely ridiculous,‚ÄĚ Sir Alex said at his Friday press conference.
‚ÄúA journalist or a TV guy asked him if he still had self-belief. Martin O‚ÄôNeill has won three titles with Celtic, he‚Äôs taken them to a UEFA Cup final, he‚Äôs been at Aston Villa, he‚Äôs been at Leicester City‚Ä¶ what a silly question.
‚ÄúIt‚Äôs an insult, an absolute insult to him. And I‚Äôm glad his chairman is supporting him because he‚Äôs an outstanding manager.‚ÄĚ