Levante attacker Emmanuel Boateng will have to undergo further evaluation to determine the extent of an injury picked up while in pre-season action.
The Ghanaian is currently away from training duty at the Spanish club after suffering the setback in Friday's 4-3 friendly defeat to English outfit Bournemouth.
He scored one of his side's goals before being forced off the pitch in the 33rd minute.
"The medical tests done to Emmanuel Boateng in the morning of today reveal that the forward has an injury in the meniscus of the left knee," the La Liga side announced on Monday.
"The attacker will be evaluated in the morning session by the surgeon, doctor Ernesto Fernandez.
"The evaluation will determine the medical decisions to be made.
"We must remember that Boateng retired in the first half of a match last Friday when Levante faced Bournemouth in the facility of La Manga.
"Boateng, scorer of one of our three goals, made a bad gesture in the first half of the game."
A serious injury could destroy Boateng's hopes of getting the season off to a glorious start after a fine debut campaign.
In his first year in Spain, the 22-year-old netted six times in 25 league games involving 10 starts to help The Frogs survive a fierce relegation fight.