Mason Greenwood and Matteo Guendouzi are the subject of a disciplinary investigation by UEFA, Fenerbahce have confirmed.
Fenerbahce's 2-1 win away at Lyon in a Champions League qualifier ended amid ugly scenes involving Greenwood and Guendouzi who both previously played for Marseille's rivals Lyon.
Guendouzi raised his middle finger to Lyon fans during the warmup and after the game and shouted "Allez l'OM" ("Go Marseille"), also grabbing his crotch, in wild post-match scenes. He said Lyon fans insulted his family before and during the game.
A post-match scuffle included someone wearing Lyon club colours confronting Guendouzi, before several players became involved in an incident in the tunnel.
It was unclear if UEFA's disciplinary judges will sanction the players before Fenerbahce opens the Champions League main phase next Thursday, hosting Roma. Fenerbahce's second game is at Aston Villa on Oct. 14.
A Fenerbahce statement read: "Following the UEFA Champions League playoff round second leg match, UEFA has initiated disciplinary proceedings against our players Matteo Guendouzi and Mason Greenwood, as well as against our club.
"Our club will present the necessary defences before the relevant UEFA bodies in order to protect the rights and interests of our players and Fenerbahce during this process.
"The necessary information, documents and defences regarding the process will be submitted to UEFA, and developments are being closely monitored by our club. We hereby inform the public."
Fenerbahce qualified for the Champions League for the first time since 2008-09 at Lyon's expense after a 3-2 aggregate win.
Former Manchester United striker Greenwood joined the Turkish club this summer from Marseille in a €39 million ($44.5m) deal.
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The Associated Press contributed to this report.
