While the former France international's ban means he is unable to play until January 1, the terms of Nasri's suspension allow him to train with any club from this month onwards.
English football is set to welcome back French playmaker Samir Nasri, one of the players who contributed to a new era of success at Manchester City.
In February, Nasri was given a six-month ban from football by UEFA, for breaching WADA rules in December 2016 by receiving an intravenous drip of 500 millilitres of water containing nutrients.
Nasri will sign a short-term contract with the London club, having last played a competitive match in November 2017 with Antalyaspor in the Turkish Super Lig.
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The former Manchester City and Arsenal player won the Premier League twice at the Etihad before leaving to play overseas.
The Chilean coached Nasri previously for three seasons in Manchester with the Frenchman playing an influential role in City's Premier League and League Cup title wins in 2014.
But the former France worldwide has encountered a troubled career since, having been banned for 18 months by UEFA for doping.
Reports have suggested that the Hammers hold an interest in Nasri, who is available on a free transfer with his doping ban due to end at the end of 2018.