Everton's most expensive pre-season signing, Gerard Deulofeu, is expected to miss the opening Premier League game against Watford this weekend, manager Roberto Martinez said on Monday.
The 21-year-old, who spent the 2013-14 season on loan from Barcelona, suffered a hamstring injury in the Asia Trophy in Singapore a fortnight ago.
"He's already working at 60 percent so I don't expect him to be too far away," Martinez told reporters.
"Maybe the weekend will be too early for him."
Everton also have doubts about another winger, Kevin Mirallas, and the England defender John Stones for Saturday's opener after both were injured in Sunday's testimonial match for former striker Duncan Ferguson against Villareal.
Mirallas will be assessed by medical staff tomorrow.
The 21-year-old has had problems with hamstring injuries before, missing two months of his loan season at Goodison after being stretchered off at home to Fulham in December.
(For more sports news and updates, follow Ahram Online Sports on Twitter at @AO_Sports and on Facebook at AhramOnlineSports.)