The ban is backdated to July 1, 2017, even though Nasri has played since then, making eight appearances for Antalyaspor in Turkey between signing in August 2017 and leaving in January this year.
Nasri, who is a free agent, can return to training with any club from November.
A Uefa statement said: “The Uefa Control, Ethics and Disciplinary Body’s decision of 22 February 2018 is amended as follows:
“1. The player Samir Nasri is suspended for eighteen (18) months. This suspension will start running on 1 July 2017.
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