From his debut, McCormack was ever-present as a midfielder or centre-forward and made a combined total of 48 National League and Championship appearances in a career that ended with his last game in 2002.
At inter-provincial level, McCormack was selected to play in two championship campaigns with Munster, however, his tenure with the team ended with a Railway Cup medal.
Flanked by Johnny Sheehan and Ian Lynch, the half-back line was described in the Cork Examiner as "very impressive", however, St. Colman's were defeated by 1-07 to 0-08.
On 13 March 1994, McCormack lined out at centre-back for Waterford Regional Technical College when they suffered a 2-12 to 1-11 defeat by the University of Limerick in the Fitzgibbon Cup final.
On 5 March, he was at centre-back when the team defeated University College Dublin by 3-15 to 1-04 to claim the title for the second time in three years.
[3] McCormack joined the Mallow club at a young age and played both hurling and Gaelic football in all grades at juvenile and underage levels.
On 22 October 1995, McCormack was at midfield when the Mallow under-21 football team faced Naomh Abán in the final of the Cork Under-21 Championship.
On 21 October 2001, McCormack lined out at centre-forward when Mallow faced Killeagh in the final of the Cork Intermediate Championship.
On 17 November 2018, he scored six points after being introduced as a half-time substitute at full-forward when Mallow suffered a 2-16 to 3-11 defeat by Watergrasshill in the final of the Cork Inter-Divisional Junior B Championship.
On 22 September 1996, McCormack was at midfield when Avondhu drew 1-12 apiece with Imokilly in the final of the Cork Senior Championship.
McCormack was eligible for the minor grade again the following year and retained his place on the starting fifteen, however, he was switched from centre-back to centre-forward.
McCormack was later included on the Cork panel for the Munster Championship and made his debut on 20 May when he came on as a 59th-minute substitute for the injured Kevin Murray in a 1-22 to 0-12 defeat of Kerry.
McCormack retained his position on the starting fifteen at centre-forward when Cork faced Kilkenny in the All-Ireland final on 12 September.
[8] McCormack won a second successive Munster Championship medal on 3 July 2000 after lining out at centre-forward but being held scoreless in Cork's 0-23 to 3-12 defeat of Tipperary in the final.
On 12 April 2008, it was announced that McCormack declared for [Kerry under the rule which allows up to five "outside" players to join weaker hurling counties.
[14] McCormack was an unused substitute throughout Kerry's unsuccessful Christy Ring Cup campaign and left the panel at the end of the season.