Italy and Villarreal striker Giuseppe Rossi is expected to spend another ten months on the sidelines.
Italy international Rossi, who tore his knee ligament in October, requires two operations to repair the damage having suffered a relapse in training earlier this month.
A Villarreal statement read: "With the objective that Giuseppe Rossi returns to his best physical condition, the most secure procedure consists of two operations.
"Villarreal offer all their support and wish the best recovery to Guiseppe Rossi."
Rossi underwent the first surgical procedure in the USA on Friday, after which he wrote on Twitter: "Operation went well. Thank God."
He is set to undergo another operation in four months and is then expected to spend six months recuperating.