The Dutchman believes that the Scottish striker is the difference maker for the side.
Celtic took another step toward defending their Scottish League Cup crown yesterday with a deserved 2-1 win over Hearts in the quarter finals of the competition.
Celtic won the game 2-1 after plenty of hard work paid off late on. Leigh Griffiths opened the scoring in the 71st minute before Tom Rogic made it 2-0 11 minutes later.
A goal from Arnaud Sutchuin-Dijoum made things tense late on but in the end Celtic were deserving winners.
After the game there was a heap of praise piled on striker Griffiths. He netted his 12th goal of the season in just his 22nd game to give Celtic the lead at Tynecastle. He also bagged the assist for Australian international Rogic's goal.
His performance specifically caught the eye of former Celtic winger Bobby Petta. The Dutchman was joined from Ipswich Town in 1999 and was with Celtic for five years before heading back to English football and finishing his career in Australia.
The 41-year-old believes that Griffiths is the player who makes the difference in this Celtic side.
Griffiths is without doubt a mercurial talent and his goalscoring record for Celtic has proved to be magnificent.
But there is ore to his game than just goals and that is appearing to become clearer than ever to those outside the Celtic circle.
If he plays like this every week, than Celtic should canter to silverware.