The holding midfielder moved to the Santiago Bernabeu from Stuttgart in 2010 and has been a regular this season, playing 34 games in all competitions.
“My life at Real Madrid is perfect,” the 25-year-old said on his website. “I feel very much at home in Spain and all I can say is that I’m the luckiest person in the world since I joined this club.”
Khedira’s performances this term have drawn praise from Jose Mourinho and the 25-year-old has previously spoken about the importance of having the faith of his coach.
The Bundesliga and La Liga winner’s form has also drawn a response from Cristiano Ronaldo, who commented on Khedira’s sense of humour as well as his contribution to the team.
He revealed: “He doesn’t tell a joke much, but when he does, it cracks you up. Sami is great for Real Madrid, both on and off the pitch.”