On 7 October 1990, O'Connor lined out in the fourth final of his career when Glenmore faced Clara. Playing at right corner-back, he claimed a second winners' medal after the 3-15 to 2-06 victory. On 25 November 1990, O'Connor claimed his first Leinster Club Championship medal after Glenmore's 0-15 to 1-09 victory over Camross. The subsequent All-Ireland final on 17 March 1991 saw Glenmore faced Patrickswell at Croke Park. O'Connor was selected at right corner back and claimed an All-Ireland medal after the 1-13 to 0-12 victory.