Career
McManus joined Celtic"s academy in 2005. He played for the team in the 2013-2014 Union of European Football Associations Youth League, scoring a 40-yard goal against A.C. (before Christ) Milan on 26 November 2013, but the 1–2 home draw nonetheless saw his team eliminated. On 3 July 2015, McManus and teammate Michael Duffy were loaned to Scottish Championship team Alloa Athletic.