Tottenham manager Jose Mourinho says he is "disappointed" after three of his players breached coronavirus rules by attending a party over Christmas.
A picture on social media showed Argentina forward Erik Lamela, Spain defender Sergio Reguilon and Argentina midfielder Giovani lo Celso at a party.
"We are not happy - it was a negative surprise for us," said Mourinho.
In a statement, Tottenham said they were "extremely disappointed" and "the matter would be dealt with internally".
West Ham reminded Argentina forward Manuel Lanzini, who also attended the party, of his responsibilities.
Lanzini apologised in a tweet on Saturday, saying he made a "bad mistake".