Everton have called Moise Kean's actions "unacceptable" after he flouted coronavirus lockdown restrictions.
The striker filmed himself partying at home with guests in a breach of social distancing regulations.
Kean, who joined from Juventus last summer, is likely to face disciplinary action.
A club statement read: "Everton Football Club was appalled to learn of an incident in which a first team player ignored government guidance and club policy in relation to the coronavirus crisis.
"The club has strongly expressed its disappointment to the player and made it clear that such actions are completely unacceptable.
"Everton has regularly stressed the importance of following all the government guidelines – including rules and advice for inside and outside of the home – through a series of official communications to all staff members, including players.
"The amazing people in the NHS deserve the utmost respect for their hard work and sacrifice. The best way to show them respect is by doing everything we can to protect them."
Kean is the latest Premier League player to flout the rules after Jack Grealish and Kyle Walker were forced to apologise for breaching the restrictions while Serge Aurier and Moussa Sissoko said sorry after training together last week.
What is graphene?
Graphene is extracted from graphite and is made up of pure carbon.
It is 200 times more resistant than steel and five times lighter than aluminum.
It conducts electricity better than any other material at room temperature.
It is thought that graphene could boost the useful life of batteries by 10 per cent.
Graphene can also detect cancer cells in the early stages of the disease.
The material was first discovered when Andre Geim and Konstantin Novoselov were 'playing' with graphite at the University of Manchester in 2004.
PREMIER LEAGUE FIXTURES
Saturday (UAE kick-off times)
Watford v Leicester City (3.30pm)
Brighton v Arsenal (6pm)
West Ham v Wolves (8.30pm)
Bournemouth v Crystal Palace (10.45pm)
Sunday
Newcastle United v Sheffield United (5pm)
Aston Villa v Chelsea (7.15pm)
Everton v Liverpool (10pm)
Monday
Manchester City v Burnley (11pm)
The biog
Marital status: Separated with two young daughters
Education: Master's degree from American Univeristy of Cairo
Favourite book: That Is How They Defeat Despair by Salwa Aladian
Favourite Motto: Their happiness is your happiness
Goal: For Nefsy to become his legacy long after he is gon
'Joker'
Directed by: Todd Phillips
Starring: Joaquin Phoenix
Rating: Five out of five stars
MATCH INFO
Syria v Australia
2018 World Cup qualifying: Asia fourth round play-off first leg
Venue: Hang Jebat Stadium, Malayisa
Kick-off: Thursday, 4.30pm (UAE)
Watch: beIN Sports HD
* Second leg in Australia on October 10