The semi-finals of the Scottish League Cup, presented by QTS, take place at Hampden this weekend.
On Saturday, Dundee United - who won the trophy in 1979/80 and 1980/81 - take on current holders Aberdeen, with a 3.00pm kick-off.
The Dons beat Inverness Caley Thistle in a dramatic penalty shoot-out at Celtic Park 10 months ago, ending a 19-year wait for silverware.
The sides have met twice in the Scottish Premiership this season, with Jackie McNamara's men winning 3-0 at Pittodrie on the opening weekend of the campaign and Derek McInnes' side responding with a 2-0 victory at Tannadice in December.
On Sunday, Celtic and Rangers meet for the first time since April 2012 in a match that is live on BBC Scotland, kick-off 1.30pm.
Celtic last won the trophy in 2009, when they beat their city rivals 2-0 after extra time, while Rangers came out on top in the Old Firm final of 2011, winning 2-1, also after extra time.
All four clubs are aiming to book a place in the final back at Hampden Park on Sunday March 15.
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