Villareal winger, Samuel Chukwueze, has undergone successful surgery on his groin.
The operation took place at a facility in Munich, Germany.
The Super Eagles star aggravated the injury during their 4-0 win at Celta Vigo in a LaLiga game.
Chukwueze has been out of action for Unai Emery’s team – missing fixtures against Tenerife, Granada, Huesca, Girona, Real Sociedad and Levante.
“Samuel Chukwueze, who was been out injured receiving treatment for discomfort in his groin, has undergone surgery this morning [Thursday] by Doctor Ulrike Muschaweck in Munich, hoping to definitively relieve him of said pain,” a statement from the club website read.
“Ruben Pena suffered muscle damage to his left hamstring in yesterday’s Copa del Rey quarter-final against Levante.
“Both footballers’ recovery time will depend on how they progress.”