griffiths: We were due bit of luck after semi
Hat-trick hero admits Bhoys got rub of the green for peno
Ronny Deila insists the penalty claim which went in Celtic's favour in the 3-0 Scottish Premiership win over Dundee United cannot stand comparison with the one that got away last week.
The third goal in Leigh Griffiths' second-half hat-trick at Tannadice came courtesy of a spot-kick awarded six minutes from time, but television pictures showed that United skipper John Rankin's initial contact on Hoops' substitute Gary Mackay-Steven came outside the box.
The irony was not lost on those who had witnessed another traumatic week in Scottish football following referee Steven McLean's refusal to award the Scottish Premiership leaders a blatant penalty for a Josh Meekings handball in the 3-2 William Hill Scottish Cup semi-final defeat by Inverness last Sunday.
The Hoops re-established their eight-point lead over Aberdeen at the top of the table with Sunday's victory but Deila appeared to be still sore about the way his dreams of a treble were ended against the Highlanders and would not broker comparisons between the two penalty decisions.
The Norwegian said: "I agree (decisions even up over a season) but what happened last Sunday was not normal.
"This is a totally different thing. I rarely talk about referees' decisions but last Sunday was a thing that really affected the game."
Celtic will clinch the title if they beat Dundee on Friday night and Aberdeen do not beat Dundee United on Saturday.
Deila said: "We have to beat Dundee on Friday and that is what we are aiming for.
"I want to win (the title) as quickly as possible."
Griffiths insisted the Parkhead club were due a bit of luck after their Hampden disappointment.
He was also grateful that nominated penalty taker Kris Commons gave him his chance to take his tally up to 18 and to become the club's top scorer.
He said: "I heard it was outside the box but we were due a bit of luck after the semi-final last week so I will take it and take the match ball too.
"Kris Commons is the normal penalty taker but I said to him I was on my hat-trick so he handed me the ball.
"He is good like that. He did it with Anthony Stokes earlier in the season so I am happy he gave me it."
dundee united 0 celtic 3