He has previously played for Livingston, Queens Park Rangers, Dundee United, Inverness Caledonian Thistle, Ross County and Dunfermline Athletic.
[1] After progressing through the club's youth system and impressing for the reserve team, he signed a new two-year contract for Livingston on 17 January 2013.
[9] On 28 January 2014, aged 19 Donaldson joined Queens Park Rangers from Livingston after impressing QPR manager Harry Redknapp during a week-long trial.
[10] Donaldson made his senior and Championship debut on 3 May 2014 in a 3–2 away win against Barnsley at Oakwell, where he was named in the starting line up and played the full 90 minutes.
[11] On 13 July 2015, Donaldson joined Scottish Premiership side Dundee United on a three-year contract following his release from QPR.