Everton striker Dominic Calvert-Lewin could miss the opening six weeks of the Premier League season after suffering a knee injury in training.
The England international, 25, missed four months last season because of a persistent muscle problem.
His absence leaves Frank Lampard’s side light up front after Brazil forward Richarlison joined Tottenham for £60m.
“Losing a player like Dominic going into the first week is obviously going to affect you,” Lampard said.
“We’ll have to work around it and other players will have to step up and do the job. Hopefully six weeks passes relatively quickly and we get Dominic back.”