Jean-Philippe Gbamin has been ruled out of Everton squad for two months following a thigh injury picked up during training last week.
The club the club confirmed that Gbamin sustained a tendon injury in his right quadriceps muscle during preparations for Friday’s 2-0 defeat at Aston Villa.
Gbamin will undergo further tests this week, with leading experts being drafted in from around Europe to ensure the swiftest possible return.
“It’s a tough moment for him of course, and we are here to support him as much as we can because it’s not an easy moment,” said Marco Silva. “But it’s part of the football, it can happen.
“He had his debut in the first game against Crystal Palace, everything was so fast for him after coming in at the end of the market. He played the whole match against Watford as well.
“The player knows what’s happened now, and it’s up to us to put him in the best condition as fast as we can.”
Fellow new recruit Fabian Delph is still on the comeback trail after injuring his groin in pre-season, leaving boss Silva short of options in holding midfield.
Everton face Lincoln City in the EFL Cup second round on Wednesday and Wolves in the Premier League four days later, before a two-week break for international action.