Griffiths is now first-choice forward under Celtic head coach Ronny Deila.
Griffiths started last season out of Ronny Deila’s plans, and he has told the Daily Record how he changed to fight his way back into the first-team, and into Celtic’s first choice striker.
He said: “Am I a different man on and off the field? Yeah, I think that’s why I’m back playing again. I’ve had to change my ways on and off the park. If I wanted to play in that lone striker role I knew I had to be fit, I had to be strong and work on certain aspects of my game. There were a whole load of things I changed off the park. I was still a bit silly but in the last year and a bit I’ve calmed down.”
Griffiths struggled at the beginning of last season, when Deila’s reign as head coach started and saw a number of players utilised as the lone forward in the Norwegian coach’s 4-2-3-1 system.
He spent a large spell of time on the sidelines when issues came about due to his fitness and lack of professionalism, but following the Christmas period, he started to impress again, and established himself as the main forward.
This season has started in the same manner as he ended the last one, staking the claim as the main striker, despite the summer signing of Nadir Ciftici - a player much more naturally suited to a lone forward role.
However, Griffiths has admitted that he sorted himself out off the field of play, and has changed his style of play to suit the tactical system, and it is hard to deny that he now deserves the role he has earned.
The 25-year-old has started this campaign in impeccable form, scoring seven goals in just 10 games across both league and Champions League, and his hot streak of form does not look like it will be ending any time soon.