The past two years have been more difficult for the 33-year-old as he battled against injury.
He also appeared to lose the total trust of manager Pep Guardiola, finding himself increasingly used as a substitute.
While De Bruyne was open to remaining at the Etihad Stadium, club chiefs opted against handing him a new contract.
I know I'm not 25 anymore, but I still feel like I can do my job.
I still feel like I can play at a good level, but after I'll have to make a decision once I really know a little bit more."
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