'I didn't see him much at Chelsea, to be honest. Not many of us did. But if you saw him in Germany, the number of goals he was involved in, it was obvious he had quality.
'It's always a test for players to come to England, play regularly and contribute, but that's what he's done. Credit to him, he's been incredible.
'He's someone I work with every day and someone I get on really well with. We arrived in the same summer. And it's so good to have someone like that in the squad. He's a funny guy, quiet, gets on with everyone in the team.'