At club level he played with numerous teams, including Kilclief, University College Dublin, Ballina Stephenites, and Greencastle.
Over the next eight years, he gained prominence in top-class football beyond the county scene, while making his early appearances for Down back home.
While playing club football in Dublin, Mayo, and Wicklow his fame became well-established with superb displays as a midfielder or forward.
He made his first Senior Football Championship appearance for Down in 1953 alongside Kevin Mussen, Jarlath Carey, PJ McElroy, and George Lavery and was a member of the team for much of the following decade.
Although he played much of his club football outside of Down due to work commitments, he always remained loyal to his native county regularly traveling long distances to represent Down.
Denvir added a Lagan Cup and a National League title to his collection in 1960 before winning a second successive Ulster medal.
Two weeks later he drew the curtain on his intercounty career winning the St Brendan's Cup when Down defeated New York in Croke Park, scoring a goal to help seal victory.