Tottenham stars Sergio Reguilon, Giovani Lo Celso, Erik Lamela and West Ham's Manuel Lanzini are believed to have broken government Covid-19 rules by spending Christmas together.
In a photo which is believed to have been posted by one of the footballer's friends on Instagram, the four players are pictured in one house with 11 other adults, two children and a baby.
Under government guidelines set out on December 19, those living in Tier 4 areas such as London were not permitted to mix with anyone outside their own household at Christmas.