Holt, who has spearheaded the promotion push with 22 goals, was full of praise for the Scottish boss after City returned to the top flight with a 1-0 win at Portsmouth.
"The manager has been fantastic. He's a motivator and has been great for us," he told Sky Sports News.
"We've got a fantastic bunch of lads here. We've worked hard and I think when we're on it there's no one better.
"We've a great team spirit and a great desire. It's a joy being with each other every day."
Source: PA
Source: PA