Sami Khedira has heaped praise on Juventus star, Cristiano Ronaldo, opining that the Portuguese is one of the best football players the world has ever known and a role model for everyone. Khedira and Ronaldo have spent five years together at Real Madrid previously and the duo are now teammates at Juventus.

"Cristiano is an extraordinary footballer and a fantastic person," the Juventus midfielder said about his teammate on Instagram on Thursday [via Omnisport]. "Meanwhile, we are playing together for seven years, five of them in Madrid and two with Juventus.

"Because of his skills and his ambitions, in my opinion, he is one of the best football players the world has ever known. He wants to win every time, even if it's a training session," the German midfielder said.

Khedira also considers himself to be lucky to have had the opportunity to play and train with Cristiano. He said, "He is a role model for all the people. That's the reason why he is one of the greatest footballers. I think I can consider myself fortunate, still play and train with him,"

The duo will be hoping to play a part in aiding Juventus to retaining the Serie A title when the season resumes. Juventus are facing stiff competition from Lazio, who are just one point short of Old Lady's 63, with 12 more games to go.