Juventus have signed highly-rated Spanish striker Alvaro Morata from Real Madrid for €20m (£15.8m).
The 21-year-old from Madrid, who scored eight goals in 23 Primera Division appearances for Champions League winners Real, has signed a five-year contract with the Serie A champions.
A statement published on Juve's official website read: "Juventus Football Club can announce that Alvaro Morata has signed a five-year contract with the club after a fee of €20m, to be paid over three years, was agreed with Real Madrid.
"The deal includes the option for Real Madrid to reacquire the player's registration rights at the end of the 2015-16 or 2016-17 campaigns, at predetermined values, up to a maximum of €30m.
"These values will be based on the number of matches played by Morata in the relevant season."
Meanwhile, Porto have signed Brazilian midfielder Casemiro on a season-long loan deal from Real.
The 22-year-old, who moved to Madrid from Sao Paulo in January 2013, has made 27 appearances in all competitions for Real but could join Porto permanently next summer.
The 27-time Portuguese champions finished in a disappointing third place in 2013-14 and new head coach Julen Lopetegui - the former Real Madrid goalkeeper - has been working hard to rebuild the first-team squad ahead of the new Primeira Liga campaign.
Attacking midfielders Adrian and Oliver Torres have arrived from Atletico Madrid, right-back Daniel Opare has signed after leaving Standard Liege, and approximately €19m euros have been spent on bringing Yacine Brahimi, Bruno Martins Indi and Cristian Tello to the Estadio do Dragao.