Arsenal release a statement revealing that they will "remind players of their responsibilities" after several of them were videoed appearing to inhale laughing gas.
Alexandre Lacazette, Pierre-Emerick Aubameyang and Sead Kolasinac are seen inhaling balloons of the gas, whilst Mesut Ozil and Matteo Guendouzi both appear to lose consciousness as a result of inhaling the gas.
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.
An Arsenal spokesman said that the players will be "reminded of their responsibilities as representatives of the club".
Premier League top scorer Pierre Emerick Aubameyang is said to feature in the video
The footage is the latest in a series of incidents of top players being linked with nitrous oxide, with Raheem Sterling being warned by Liverpool after footage emerged of him using the substance in 2015.
"Arsenal negotiated another hard task at Old Trafford on Wednesday and Unai Emery's reign continues to gather momentum", he told the Mail.
The North London club sit in fifth in the Premier League table, only behind fourth-placed Chelsea on goal difference.
Nonetheless, Unai Emery and his men extended their unbeaten streak to 20 matches in all competitions this season.