McCabe was born in Ringsend, Dublin. He grew up playing with his local side Cambridge Boys and Ashbourne United in Meath among others, before deciding to travel to the United States to pursue a scholarship offer and a chance to earn a degree at Young Harris College.
College and youth
McCabe played four years of college soccer at the NCAA Division IIYoung Harris College between 2010 and 2014, after playing soccer in his high school years with Colaiste Ide in his hometown of Dublin, Ireland. In 2012, McCabe led the Peach Belt Conference in goals and was second in assists; winning the conference's Golden Ball and being named to the All-Conference 1st team. In 2013 he was named to the All-Conference 2nd team. McCabe totaled 32 goals and 31 assists in 62 games at Young Harris to place second all time in goals and first all time in assists at the school. While at Young Harris, McCabe played in 2012 and 2013 for Knoxville Force of the NPSL, but in 2014 moved to Chattanooga FC in the same conference. For Chattanooga, McCabe totaled 5 goals in the 2014 NPSL season, which took Chattanooga FC to the NPSL finals.
McCabe joined USL club Louisville City FC on February 12, 2015 and made his debut in Louisville City FC's first game. He appeared in 27 of the club's 28 regular season matches; starting 17. He scored 4 goals on 16 shots on goal.
2016 season
McCabe scored 2 goals and registered 4 assists while appearing in only 21 matches. He had season ending surgery to repair a hip labral tear on his left side which his originally injured during the 2015 season. His last game was August 10 against the Harrisburg City Islanders; missing all of the USL Cup Playoffs.
After staying in Louisville to rehab over the winter McCabe was able to train with the team during the preseason and appear in the team's opening match. He would go appear to appear in 23 matches and score 3 goals with 4 assists in league play. On April 22 McCabe was bitten by Djiby Fall while playing rival FC Cincinnati. Djiby Fall would be sent off and suspended for 6 games while McCabe received a tetanus shot. Louisville City would go on to win the USL's Eastern Conference and the USL Cup. McCabe would be named to the match squad for all 4 playoff matches but would only appear in the Conference semifinal against Rochester.
McCabe had his contract renewed with Louisville and he made his season debut on March 17 against USL expansion side Nashville SC where earned both a goal and an assist. He went on to appear in 22 of Louisville's 34 matches while scoring four goals with four assists. He also appeared in two of Louisville's five U.S. Open Cup matches as Louisville reached the quarter finals of the competition for the first time in its history. This included a 3–2 victory over the New England Revolution of MLS; Louisville's first victory over an MLS side. McCabe also appeared in all four of Louisville's USL Cup matches and scored two goals in Louisville's first round match against the Indy Eleven; his first brace as a professional. He and Louisville went on to win the USL Cup Final against Phoenix. On October 9 McCabe became the first Louisville player to reach 100 combined appearances in both the USL and USL Cup playoffs. He finished the year with 111 appearances across all competitions.
2019 season
McCabe resigned with Louisville for the 2019 season as the final player from the original roster to remain with the club.
