Enzo Maresca has said that Chelsea's form has "100%" been affected by transfer speculation, claiming some of his players may not have been fully focussed.

Chelsea head coach Enzo Maresca said goalkeeper Robert Sanchez cannot “make a mistake every game” and expect to keep his place as he hinted he could turn to understudy Filip Jorgensen for Monday’s game against West Ham.

Enzo Maresca is going to leave it late before deciding whether to start Robert Sanchez in goal in Chelsea’s game against West Ham on Monday night. Sanchez, 27, has been first-choice keeper since Maresca took charge in the summer but has become a target of abuse from the club’s fans after making several high-profile mistakes.

In November, he suggested that Jamie Vardy was the best English striker of his generation, better even than Wayne Rooney or Harry Kane. He also claimed that League One side Barrow and then a doomed Southampton were the “worst” possible opponents for his Chelsea side, who went on to score five in both games.

Several Chelsea players have been the subject of speculation in the January transfer window, which is impacting the club's form, manager Enzo Maresca said on Friday ahead of a Premier League meeting with West Ham United.