Rangers assistant Ally McCoist is determined to hold on to the trophy
Scottish Cup holders Rangers will meet St Mirren in the semi-finals of this season's tournament.
The other tie will see the SPL's bottom club Falkirk meet either Aberdeen or Dunfermline, who face a replay at Pittodrie on 17 March.
If St Mirren are to reach their first final since winning the cup in 1987, they will have to complete an Old Firm double, having already defeated Celtic.
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