The Hoops will now make the first of two visits to Ibrox in the space of a fortnight over the weekend of April 17-18, with the winner going on to stage a quarter-final clash against St Johnstone or Clyde.

Complacency robbed the Light Blues of the chance to make this year's Betfred Cup the first trophy of the Gerrard reign as they were stunned by St Mirren back in December.

But there was little chance of a repeat of their only domestic slip-up even as Gerrard made seven changes to the team which drew 1-1 with Celtic a fortnight ago.

Patterson and Calvin Bassey started in the full-back slots after Gers appealed their four-game bans for breaching lockdown rules while Scott Wright came in for his first start since joining in January.

Cove were not lacking in top-flight nous with ex-Aberdeen trio Mitch Megginson, Jamie Masson and Fraser Fyvie included in Hartley's line-up.

But there was little sign of that experience on show as the Aberdeen outfit continually shot themselves in the foot by insisting on playing out from the back.

They did well to survive three big chances inside the opening 11 minutes, including a Roofe shot which hit the post before bouncing into the grateful arms of Stuart McKenzie.

Having stemmed those early waves of attacks, Cove got a bit too cocky as they again tried to build up from their own box.

It proved to be a costly mistake as Gers pounced on 24 minutes. Steven Davis regained possession from Adam Livingstone's heavy touch and Rangers ruthlessly sprung forward. Glen Kamara fizzed the ball into Defoe's feet, with the 38-year-old spinning past Fyvie before drilling home with a low drive.

Another self-inflicted error cost Cove the second seven minutes later. Broque Watson and Daniel Higgins got themselves in a muddle as Bassey applied pressure. Defoe took over, sweeping the ball to Scott Arfield's feet. McKenzie saved the midfielder's effort but Roofe was there to turn home the rebound.

The former Leeds ace had another 60 seconds later as he darted across Higgins to turn home Wright's ball to the front post.

And Gers were four-up two minutes before the break as Cove again failed to learn their lesson. With his team already under a heavy press, Higgins attempted a suicidal square ball across his own box, with the inevitable result as Patterson stole ahead of Livingstone to tuck home his second goal for the club.

The visitors' afternoon took another turn for the worse when Masson had to be stretchered off with a nasty ankle injury after his studs caught in the turf just on the hour mark.

But at least there was no further damage to the scoreline despite another second-half bombardment that saw Defoe, Connor Goldson and Cedric Itten come close.