Former Manchester City midfielder Samir Nasri’s ban was increased from six to 18 months.
The Frenchman was suspended by UEFA in February after breaching the anti-doping rules during the time he was on loan from City to Sevilla.
Nasri received a drip treatment which had a prohibited substance at a Los Angeles clinic in December 2016 while on holiday.
Uefa’s ethics and disciplinary inspector argued that Nasri’s initial six-month ban was insufficient and on Wednesday the European governing body extended his suspension to 18 months.
The 31-year old, 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. 2. The player Samir Nasri is allowed to return to training, with any football club starting from 1 November 2018.”