Mesut Ozil, Pierre-Emerick Aubameyang, Alexandre Lacazzette and Matteo Guendouzi are among Arsenal players that have been warned about their conduct after a video emerged of them appearing to inhale 'hippy crack'.
The video, obtained by The Sun shows the players in a London club days before the start of the season appearing to use nitrous oxide, and while the gas is freely available it is illegal to sell for recreational purposes.
Shkodran Mustafi and Sead Kolasinac are also seen in the video with balloons in their mouths, which is how the gas is ingested. Henrikh Mkhitaryan is also seen in the video, though the Armenian wasn't seen with a balloon.
Arsenal have said in a statement that they will remind players of their responsibilities:
The players will be spoken to about this and reminded of their responsibilities as representatives of the club.