Tottenham boss Mauricio Pochettino is refusing to concede the Premier League title to Chelsea, but admits it will be "difficult" after defeat at West Ham.
Spurs remain four points behind Chelsea after Manuel Lanzini's goal gave the Hammers a 1-0 win at London Stadium.
Chelsea, who host Middlesbrough on Monday, need two wins from their final four games to be crowned champions.
"It is not over, We have to wait but are thinking that it will be difficult to catch Chelsea," said Pochettino.
"I feel calm. But I'm disappointed, of course, that we missed the opportunity to reduce the gap.