Khedira has penned terms to 2021.
“You must always give your all and be proud of playing for this club, because it's the best in Italy and I hope it will be the best in Europe.
“In the last four years Juventus have lost the Champions League final twice, but if you get to the final twice in four years it means the team is strong and just needs something special to win.
“With Cristiano - even if having him in the team doesn't automatically mean you'll win the Champions League - we have something special, he helps you and motivates you to compete at high levels.
“I hope that through hard work we'll succeed in winning the Champions League this year. Winning the Scudetto and the Coppa Italia is always difficult and it's clear we want to keep doing that, but we also intend to take home the European Cup too.
“I know that the players, the club and above all the fans dream about it and we need to work to turn this dream into a reality."