Aberdeen are facing an anxious wait to discover the severity of Tommie Hoban's knee injury.
Third-placed Aberdeen failed to take advantage of Rangers dropping points as they were held to a 2-2 draw by struggling St Mirren.
Two men have been charged over allegations of racially offensive remarks made at the Scottish Premiership clash between Aberdeen and Rangers.
Scott Sinclair's second hat-trick of the season was the catalyst as Celtic thrashed St Johnstone 5-0 to claim a place in the Scottish Cup quarter-finals.
Rangers moved five points clear of Aberdeen after a 4-2 win at Pittodrie which saw Alfredo Viewslos and Scott McKenna sent off.
Top two Celtic and Rangers both won but Kilmarnock slipped up on a busy night of Scottish Premiership action.
Re-live the action as Rangers beat Aberdeen 4-2 in a heated clash at Pittodrie.
Rangers forward Alfredo Viewslos was sent off against Aberdeen for the third time this season in a fiery Scottish Premiership clash at Pittodrie.
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