3 talking points as Celtic power past Dundee United thanks to goal hungry Giorgos Giakoumakis

Celtic completed a blockbuster Scottish Cup semi-final line-up with a hard-earned victory over Dundee United.

Ange Postecoglou 's side will join Rangers, Hearts and Hibs in the final four at Hampden thanks to Callum McGregor and a double from the returning Giorgos Giakoumakis.

The Parkhead side were shorn of Jota and Liel Abada for an ever-perilous trip to Tannadice but again showcased their increased strength in depth with a clinical display.

McGregor's deflected effort secured a crucial early advantage before Giakoumakis pounced on an error from keeper Benjamin Siegrist to thwart United's rising resistance in the second period.

Celtic remain in the hunt for a Treble and are now unbeaten in their last 30 domestic matches, a run which stretches all the way back to September.

They were met by United's characteristic commitment and discipline but were rarely troubled Tam Courts' team.

Giakoumakis replaced the injured Jota and James Forrest kept his place in Abada's absence, with Daizen Maeda moving to the left hand side.

Maeda had a sizeable away support off their seats in the opening moments as his ambitious lobbed effort landed on the roof of Siegrist's net.

The first sign of life from the home end was sparked by an early penalty claim that never was when Marc McNulty went down under pressure from Carl Starfelt but, if anything, it was the United striker who had grip of the Swede's shirt and John Beaton was uninterested.

Minutes later, Clark had the final touch as the ball rifled into the net - unfortunately for him it was to divert McGregor's powerful low drive away from and beyond Benji Siegrist.

The Celtic captain had stepped into the area from a short corner and firing into the ruck of bodies assembled in front of