‘Keeper who joined Blues after impressing manager Mick McCarthy whilst on trial with the Club.
The stopper will again battle it out with Bartosz Bialkowski for the number one spot at Portman Road this term, with both he and the Pole playing over 20 matches each last term.
He is under contract until the end of the 2016/17 season.
Dean has experience of the Championship after spending time with Colchester United and Bristol City earlier in his career.
Player sponsor: Christine & Mark Smith - Margery's Private Day Nursery