The 42-year-old, who spent four years at City, believes the midfielder's heart is no longer with The Citizens.
And with Roberto Mancini reportedly keen to lure the Ivorian to Inter Milan, Sinclair thinks it's time to cut ties.
I don't think he's committed to the club anymore
Trevor Sinclair
Speaking to Sky Sports News, he said: "Just from last year, after his birthday, his agent came out and said he was disappointed.
"I don't think he's committed to the club anymore.
"He's a massive fan favourite and has been a fantastic servant but I think now is the time to let him go and experience some other football and bring in some fresh blood."
GETTY
Trevor Sinclair believes Yaya Toure has lost heart with Man City
Toure has been at the Etihad for nearly five years now since joining from Barcelona in 2010.
However, the 31-year-old has had an indifferent season and has failed to hit the heights he reached last campaign.
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