The veteran says all that remains is an announcement.
He joked: "I have to ask the club again about when they are going to announce my renewal because I have to go on vacation at some point."
Meanwhile, Kroos also commented on the sacking of chief exec Oliver Kahn by former club Bayern Munich.
He said on Real Total: “I heard from Kahn that he was not allowed to go to the title celebration. Bayern is giving a somewhat questionable image.
"It's a shame for the players and especially for the new coach, they wanted to celebrate the title and they found the trouble.
"To confirm a farewell on a day like this... I haven't heard more than that, but I believe Kahn."