The Bayern Munich midfielder is set to fly to Spain ahead of an expected switch to the Santiago Bernabeu, though his agent insists that no decision has yet been made
The midfielder is expected to join Los Blancos after failing to agree an extension to his contract with the Bundesliga club, which has one year left to run.
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"It is not decided where Toni Kroos is heading. I can guarantee that," Volker Struth told Express.
"We will travel to Mallorca on Tuesday, when we will sit together and decide what he will do. On Tuesday evening or Wednesday in the morning we will announce the decision."
Bayern spokesman Markus Horwick, meanwhile, was unable to offer any insight into Kroos's future, explaining that the ball is in the midfielder's court over his next step.
He declared: "We are waiting for an official reaction by Toni or his management. Only then we can speak about it."
Kroos was part of the Germany side who lifted the World Cup on Sunday evening after Mario Gotze fired them to a 1-0 win over Argentina in extra time.