Axel Witsel hopes Belgium teammate Eden Hazard gets his move to Real Madrid.
The 28-year-old has said goodbye to Chelsea after seven years.
And BVB midfielder Witsel thinks Hazard can prove his class at the Bernabeu.
"Of course [Hazard] is that good," Witsel told Sky Sports News.
"Eden is the type of guy who is always relaxed. He doesn't think too much [about his future].
"He's just come here today. We spoke about everything but not about a transfer to Real Madrid because that is just Eden.
"For me, as a player, he is one of the best with Cristiano (Ronaldo), (Lionel) Messi and Neymar.
"If he goes to Real Madrid - and I hope so for him - he is going to show that to everyone."