Adama Traore has been banned from lifting weights at the training ground, by West Ham manager Nuno Espirito Santo.
The winger's muscular frame has been described as "incredible" by Nuno, but he warned the 30-year-old already "carries enough weight".
The Spaniard previously made the surprising claim that he did not lift weights, but team-mate Crysencio Summerville posted a video on social media of Traore bench-pressing 145kg at the club's training ground in Rush Green last week.
"It's incredible [his physique], it's genetics. [But] his genetics has been like this for some time now and he should avoid the gym," said Nuno, speaking at a news conference before Wednesday's Premier League match at Fulham.