Griffiths, 24, netted a second-half hat-trick in the Bhoys 4-1 victory over Kilmarnock to take his league tally to eight, and Ronny Deila has told the Evening Times that he is still keen to see the forward improve.
“He's improved a lot in my time here,” the Norwegian head coach said of Griffiths. “He's training well and as a 24-hour athlete he's been getting better and better, even though he eats cakes on the bench sometimes.
“But it's just a start - he needs to keep working on small things and he'll get even more goals.”
Griffiths three-goal haul took his seasonal tally to eight in 17 games, with just eight of those appearances coming as a starter, as Deila has utilised a rotational policy in his forward line.
He has 14 strikes to his name in all competitions, thanks to a great return in the League Cup and Scottish Cup, and he is unfortunate to have not been given more chances by Deila in the Premiership.
Regardless, there is a visible improvement in the Scottish international’s ability at this stage of the season, having started the campaign as only a fringe member of the squad, and after missing a sizeable number of games due to fitness issues, he is now a frequent selection in matchday squads - if not as a starter.
However, his recent goalscoring form should do much to set that right, and, with Deila urging him to further improve, Celtic could have a truly consistent goalscorer in their ranks in the not too distant future.