Former sporting director at Bayern Munich, Matthias Sammer has revealed he tried to keep Kroos, as he feels it was a mistake selling him.
The Germany international won three Bundesliga titles and the UCL, before leaving for Madrid in 2014.
Toni Kroos remains a key part of Madrid and Sammer believes the move did him good.
“Sometimes there are situations that you have to analyse honestly in retrospect,” the ex-Bayern sporting director said in an interview with Sport Bild , which hosted Kroos as a guest editor this week.
“Who can say they have done everything right in life? Maybe Bayern Munich would have won the Champions League more often with Toni or at least reached the final.
“I can say today that, in my role, it was a mistake to let Toni go. I was sitting on Toni’s couch trying to change his mind.
“I’ve been able to work with him for a long time and have known him since he was 16 or 17.
“His departure didn’t shake Bayern, but when you talk about whether it was good or bad to let Toni go, you have to say it was bad, very bad.
“But for Toni’s personal development and value, the change was definitely the right one.”