Off contract in June, Mbappe is expected to join Real at the end of the season.
Kroos told TVE: "It is interesting to sign Mbappé, he is a very, very top player and here we always want players like that.
"It is no secret that Madrid loves him."
Kroos was also asked about the form of teammate Eden Hazard.
He added: "I trust him, from one day to the next you don't lose quality."
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