Leigh Griffiths insists Celtic need to be wary of lightning striking twice after the Ladbrokes Premiership leaders were drawn at home to Greenock Morton in the quarter-finals of the William Hill Scottish Cup.

The draw at Hampden Park, which had to be re-run after one of the plastic balls opened after the Hoops had been paired with Dundee United at Tannadice, saw the Championship side set for a return to Parkhead, the scene of a famous and unlikely League Cup win in September, 2013.

Dougie Imrie's penalty in extra-time shocked the home side and Griffiths believes the current Celtic team need to be on their guard.

The 29-goal striker said: "The last time they played us at Parkhead they beat us so we need to be wary of that.

"The players like Scott Brown, Charlie Mulgrew, James Forrest, who were involved in that squad just before I signed will be telling everybody else that regardless of the opposition we need to take care of them professionally."

Morton midfielder Joe McKee, who was injured when Ton beat Celtic, is looking forward to playing a full part this time.

He said: "I had an ankle injury at the time and was in the stand watching, but the boys were magnificent that night and they pulled off a shock so these things happen.

"You see cup shocks happening now and again so you never know.

"I was down in the changing room with all the boys and the atmosphere was unbelievable.

"Obviously mixed emotions for me that night, not to be playing but it was a great atmosphere and I was happy for all the boys.

"We will go and try to give a good account of ourselves and see what happens."

Holders Inverness were handed a tough tie with a trip to either Hibernian or Hearts who will play again at Easter Road after a 2-2 draw at Tynecastle.

The winners of the Rangers and Kilmarnock replay at Rugby Park will take on Dundee or Dumbarton, who have to play again after a goalless draw, while Ross County host Dundee United with the ties to be played over weekend of March 5 and 6.