Alexandre Lacazette looks set to be in hot water with Arsenal chiefs after appearing to inhale nitrous oxide.
Lacazette, who is on £180,000-a-week at the Emirates, could be fined for his actions by the club.
An Arsenal spokesman said: “This is a private matter which we are taking seriously. It will be handled internally.”
It is the second time in which Lacazette has been seen with a gas-filled balloon in his mouth.
The 28-year-old, along with Arsenal teammates Mesut Ozil, Pierre-Emerick Aubameyang and Matteo Guendouzi, were ‘reminded of their responsibilities’ by the club after inhaling nitrous oxide in a private room inside a London club before the start of the 2018/19 season.
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Lacazette has been in the spotlight for the wrong reasons since the coronavirus pandemic suspended Premier League football in March.
Last month, the France international appeared to ignore coronavirus social distancing rules by having his car cleaned on his driveway.
Lacazette has scored 45 goals in 114 appearances since joining Arsenal for £46.5million from Lyon in 2017.
But he has failed to hold down a regular starting place under Gunners current boss Mikel Arteta, who has at times opted for Aubameyang and youngster Eddie Nketiah instead.
Spanish outlet AS claim Arteta is willing to let Lacazette leave in order to raise transfer funds amid interest in the striker from Atletico Madrid.
Lacazette, whose Arsenal contract runs until 2022, has netted nine times in all competitions this season.