"Valencia have completed the signing of Simone Zaza on loan from Juventus until the end of the season," Valencia said in a statement.
"The player passed a medical with the club and signed his contract on Sunday. The agreement will see him become a Valencia CF player until the conclusion of the 2016/17 campaign, with an option to buy."
Zaza has only recently returned to the Italian champions after a miserable spell on loan with West Ham United as he failed to score in 11 games earlier this season with the Premier League side.
The 25-year-old's arrival capped a fine Sunday for Los Che after they registered a first La Liga win in nine games to move four points clear of the relegation zone with a 2-1 victory over Espanyol.