Juventus announced a double midfield signing on Friday, bringing in Tiago from Lyon and Sergio Bernardo Almiron from Empoli.
Portugal midfielder Tiago's deal was announced several days ago and the 26-year-old will cost 13 million euros to be prised away from the French champions.
He spent two years in France, winning two titles, since leaving English Premiership side Chelsea, who he joined from Benfica in his native country.
Almiron, also 26, will cost nine million euros.
He began his career at Newell's Old Boys in his home country before heading to Italy and Udinese in 2001. He had a spell at Verona before joining Empoli in 2004.
Meanwhile heading out the door is Croatian defender Robert Kovac who has joined Germans Borussia Dortmund after two years in the north of Italy.
Kovac is no stranger to the Bundesliga having previously spent ten years in the league playing for Nuremberg, Bayer Leverkusen and Bayern Munich.
Juventus were promoted back to the Italian Serie A last season after just one year in the second division following their relegation for match-fixing.
They have been on a spending spree since winning the Serie B title, signing Czech defender Zedenek Grygera from Ajax, veteran Bosnian midfielder Hasan Salihamidzic from Bayern and young Italian Domenico Criscito from Genoa.