Argentine striker Luciano Vietto has been sold to Atletico Madrid, Villarreal club president Fernando Roig announced on Monday.
Vietto, 21, joined Villarreal last summer from Racing Club in a reported €5.5 million deal, signing a five-year contract with the Yellow Submarine.
The forward enjoyed an impressive debut season in Spain as he scored 12 goals in 32 league appearances to help the club finish sixth in La Liga, and Villarreal have reportedly accepting a £15 million (€20.9m) offer from Atletico.
"We have sold Vietto to Atletico Madrid," Roig said in a news conference on Monday.
Atletico coach Diego Simeone knows Vietto well having signed the player from Estudiantes while he was in charge of Argentine side Racing Club in 2011.
Simeone's side are keen to strengthen their attacking line this summer given the impending sale of Croatia international Mario Mandzukic to Juventus.
Atletico finished third in the Primera Division last month having won the title in the 2013-14 season, and will play in next season's Champions League.
Vietto had previously said in April that it would be "a dream come true" to play alongside Barcelona's Lionel Messi.