Griffiths is one of the best players in the Scottish Premiership and is an important player in the current Celtic squad.
The Scotland international striker was banging in the goals left, right and centre last season and was arguably the Bhoys’ best player.
The 26-year-old, though, is not guaranteed a place in the Celtic starting lineup at the moment.
The form of Moussa Dembele so far this campaign is keeping Griffiths out of the team.
Dembele, who is 20 years of age and plays as a forward, has been scoring goals for fun for the Hoops so far this campaign.
Stewart, who also played for Hibernian and Heart of Midlothian, has suggested that Rodgers should be happy that he can call on Griffiths from the substitutes’ bench.
“Leigh was flying at the start of the season before he got injured and that opened the door for Moussa Dembele to come in against Rangers,” Stewart wrote in The Scottish Sun.
“He had struggled a little bit to settle at the club but from then on he didn’t look back and Leigh had to sit on the bench and wait for his chance to come again.
“But it is a great problem for Brendan to have on the bench a guy who scored 40-odd goals last season and is desperate to play.”
Celtic are at the top of the Scottish Premiership table at the moment with 40 points from 14 matches.
The Bhoys are eight points clear of second-placed and Old Firm rivals Rangers and have three games in hand.
The Glasgow giants will return to action on Tuesday evening when they take on Hamilton Academical at Celtic Park in the Scottish Premiership.