He told the Manchester Evening News: "He's a no-nonsense grafter.
"First and foremost, you've got to be hardworking; he doesn't suffer fools. I'll be honest, it wouldn't surprise me if he'd been planning this sort of trajectory; even his goal-setting would have been on it. I think for him to potentially get this opportunity at one of the biggest clubs in the world, it is a testament to his sheer determination and his class."
Roberts also said: "If I could compare him, and it's giving him a big accolade, it's putting him on a level with Txiki Begiristain because I worked closely with Txiki when I was at City for a number of years. I worked with Brian Marwood for years. I think I would definitely put Mitch in the bracket of those guys.
"What Txiki has done for City alongside Pep, he does everything with a level of class. He's the best in class; he is the best. A Rolls Royce. He has a personal touch with everyone—new signings, the kitman. Making sure everyone is in it as a team. He is unbelievable at it. I've always been a big advocate of that sort of behaviour, and Txiki took it to another level for me. That is the biggest compliment I can pay Mitch; he's on his way to being somebody as close as Txiki as I have ever seen."