Senior Debut: v Llanelli Scarlets, May 2006, Stradey Park.
Heineken Cup Debut: v Gloucester, April 2008, Kingsholm
Club: Cork Constitution
Previous Club: UCC
School: St. Munchin's
International Honours: Ireland A; Ireland
Another product of the Munster Academy, his father Gerry was a member of the Munster squad that defeated the All Blacks in 1978.
Denis made his first competitive start for Munster against Llanelli Scarlets in Stradey Park in May 2006.
He added just one cap to his total the following season but in 2007/08 became something of a cause celebre when making his debut, and preferred to Shaun Payne, for the Heineken Cup quarter final clash with Gloucester at Kingsholm.
Denis went on to start in the May Heineken Cup Final against Toulouse, playing his part in Munster's second Heineken Cup win.
He won his first international cap (v USA in Santa Clara, California) and a Churchill Cup medal with Ireland A in summer 2009.