Barcelona coach Ronald Koeman has spoken of working with Liverpool defender Virgil van Dijk.
Van Dijk's season appears over as he prepares to undergo knee surgery.
Koeman said of his former Holland defender: "It was great to work with Virgil because he is an open person, one who communicates.
"He likes to learn from everyone. He had to change his character because he was too lazy at times. Some say that his football is a bit arrogant. We worked a lot, but the credit goes to him.
"For me today he is one of the best defenders in the world."
