The winger has turned down a new four-year deal with the Scottish Premiership champions.
Pat Bonner is hoping that Celtic will be able to reach an agreement with James Forrest regarding a new contract, and suggested that the winger should be in Ronny Deila's side every week, BBC Sport reports.
The 24-year-old sparked rumours suggesting that he was on the verge of quitting the Scottish Premiership champions after rejecting a new four-year deal at Parkhead, especially as his current contract expires later this year and both Norwich and Queens Park Rangers are interested in signing him (via BBC Sport).
However, while Bonner has admitted that Forrest has not been up to standard at times this season, he insisted that he wants him to stay and become a focal point of the side.
"He should be a regular fixture in the starting line-up every single week," he told BBC Sport.
"I would love him to stay at Celtic because there is no better place if you are playing really well."
"There are times when I'm surprised he's not in the team and there are times when he is that I'm surprised he's not effective enough.
"When he is effective, there's nobody better at getting the fans up out of their seats."
As the former goalkeeper alluded to, Forrest has come in for criticism this season due to his inability to deliver on a regular basis. When he first burst onto the scene, he provided a huge level of excitement every time he got onto the ball and Celtic fans learned to expect something special to happen when he was involved.
However, it is fair to say that he is yet to deliver the talent that his potential promised. And while Bonner wants Forrest to commit his long-term future to the club, it seems almost inevitable now that he will soon be leaving for a fresh challenge.