Career
Having played for AFC Wimbledon since age eight, Sweeney made his Football league début for AFC Wimbledon on 6 April 2015, coming on as an 80th-minute substitute during the 4–0 away loss against Dagenham and Redbridge. He started Wimbledon"s next match on 11 April 2015, a 0–0 draw against Oxford United at Kingsmeadow, and was named man of the match. Sweeney signed his first professional contract with AFC Wimbledon in February 2015.
On 18 May 2015 Sweeney was called up to the Ireland U-18s squad for the first time.