Signed from Oldham Athletic in 1990 at the age of 24, Denis went on to become a fulcrum of Sir Alex Ferguson's first two great sides, helping United to the Double in 1994 and 1996 and, most memorably of all, the 1999 Treble.
Overall, the Republic of Ireland international, who could play at left-back or right-back, made 529 appearances for the Reds, placing him ninth in the all-time list.
A mean set-piece taker, Irwin netted 33 goals during his time with United, including today's Goal of the Day, against Wimbledon, which you can see below...
SIGNING FOR UNITED
Irwin had been part of the Oldham side which had taken the Reds all the way to a replay in the 1990 FA Cup semi-final, and he joined us that same summer for what would turn out to be a bargain fee of £625,000.