The winger joined the hoops three years ago and was an instant hit driving the club to an Invincible Treble and scooping most of the Player of the Year awards.
Towards the end of last season Celtic activated a 12 month option in his contract that is believed to have him as one of the highest paid players at the club.
Sinclair was left out of the squad that travelled to Romania to face Cluj in order to help him find an English club but that deadline passed without any movement with the 30-year-old failing to make the bench in Celtic’s last three matches.
That looks unlikely to change today against Hearts but Lennon insists that there has been no clash with the one time £10m Manchester City signing.
Asked if the player felt mistreated Lennon told the Daily Record:
If he feels like that, it’s understandable. We don’t want to treat him badly because he’s a senior pro. It’s just that he’s finding it difficult right now to get into the squad. I can’t pick six wingers. Our wide men have been playing so well and we’ve been scoring goals. We look a threat. We have good pace in the team, something which Mikey brings to us.
Sheffield United, Middlesbrough and Preston have all been linked with Sinclair but with the English window closed his only chance of a move would be to the continent with the USA unlikely at this stage of their season.