"The tests done on the player Roberto Soldado have confirmed that the Villarreal striker suffers an anterior cruciate ligament tear and a torn external meniscus in his right knee," Villarreal said in a statement.
"The player will have to undergo surgery in the next few days."
The estimated recovery time for this type of injury is at least six months.
Villarreal host Monaco in the Champions League play-offs on Aug. 17 with the return leg being staged six days later at the Stade Louis II.
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(Reporting by Adriana Garcia, editing by Susanna Twidale)
