O'Callaghan on trial at Crewe

He said: "He has looked good in training and certainly isn't fazed by anything,"

"He also has a very good presence out on the pitch.

"His fitness isn't quite right, although he has been playing for non-league Worksop Town, and we need to get him into better shape. We'll keep him here for the next month and he could play if we needed him to."