“Losing a player of Dom’s quality is obviously going to have an impact,” Lampard said. “I think we’re probably looking around six weeks for the injury.”
The Athletic reported earlier on Thursday that Everton are ramping up their search for a striker, in light of Calvert-Lewin’s injury.
Lampard also confirmed that defender Yerry Mina will be fit for Saturday’s game, as well goalkeeper Asmir Begovic who has returned “ahead of schedule”. Allan will be in the match-day squad but still needs more “match fitness”, while fellow midfielder Andre Gomes is still a week or two away from returning and Tom Davies should resume training next week.
Club captain Seamus Coleman will play for the Everton Under-21s on Friday in order to build up fitness.
Calvert-Lewin’s injury means Everton now have no senior centre-forwards fit for the visit of Chelsea, with Salomon Rondon suspended and Richarlison having departed for Tottenham Hotspur earlier in the summer.
The Merseyside club have, though, matched West Ham United’s bid for Lille midfielder Amadou Onana.
It is understood Everton have tabled an offer of €30million (£25.3million, $30.6million) plus add-ons for the 20-year-old.
Calvert-Lewin missed much of last season with a persistent quadricep problem but had featured regularly in pre-season.
(Photo: Getty Images)