Noni Madueke has been seen in a video posted online of him partying at a nightclub in Mayfair in London during the international break.
The Chelsea winger played 76 minutes during England U21s 3-0 win against Luxembourg last week, teeing up Callum Doyle for the side's second goal after half-time.
The 21-year-old had enjoyed a successful summer with Lee Carsley's, appearing in all of their games at the European U21 Championship, to help the side claim victory at the tournament.
But Mauricio Pochettino revealed that he was one of several players to return from the international break after having picked up an injury.
'Noni [Madueke] came from the national team with a muscle problem,' the Blues manager said earlier this week, according to the Evening Standard.
Madueke missed Chelsea's goalless draw against Bournemouth but the outlet claims that the Blues are 'not concerned by the problem and hope the youngster is able to feature again before the end of the month'.
A video has emerged on social media showing the Chelsea forward partying in a club called Plug during the international break.
The video shows the forward dancing in a crowd of people before having confetti thrown at him.
He arrived at Stamford Bridge in January this year, completing a £26million move from PSV Eindhoven before signing a seven-and-a-half year contract.
He made his Premier League debut during a goalless draw against Fulham in February, before scoring his first goal for the club against Arsenal later that month.
Madueke went on to make 12 appearances for the London club last season, but was ruled out of the Blues' pre-season tour of America, after sustaining an injury after returning from England's U21 European Championship campaign.
He was not the only absentee last weekend, with Moises Caicedo also missing out on the trip to the Vitaliaty Stadium.
But the Blues are hopeful that both can make a recovery to play in their Premier League match against Aston Villa this weekend.