Celtic boss Ronny Deila has warned the Scottish Premiership that there is plenty more to come from Leigh Griffiths following last night's hat-trick against Kilmarnock.

The former Wolverhampton Wanderers hitman came off the bench to grab a second-half treble and help the Bhoys to a 4-1 win at Parkhead.

Those heroics took his total for the season to 15, but Deila says that this is just the start for the 24-year-old.

"He was fabulous. You can't do better than three goals and his contribution was excellent. He could be a kicker in American football, I think," he told reporters.

"He has improved a lot. He is training well and as a 24-hour athlete he is getting better and better - even though he eats cakes on the bench sometimes.

"But still it is just a start and we will continue working on small things to get him better and we will get even more goals."

Darryl Westlake opened the scoring for the visitors on the 50-minute mark, before Scott Brown reduced the arrears shortly after as the Hoops ultimately went eight points clear at the summit.