"Clearly I'm really sad for Frank and his staff. I know how much the club means to him," he said.
"Looking at the squad and how young they are, they need time. He hasn't been given that time. I really feel for him. He did great at Derby.
"He had the courage to step out of an amazing career and could have taken an easier route. It was a job he couldn't turn down, even though he didn't have a lot of experience.
"Results haven't been what he would have wanted, but I feel it's a job that needed time."