Karl-Heinz Riedle believes Ilkay Gundogan would be the perfect signing for Barcelona should he leave Borussia Dortmund.

"I think it's a real pity that he will leave Dortmund, but I can only congratulate him if he joins Barcelona," Riedle told Goal.

"Barcelona are the club that perfectly fit his style of play. He is a sensational player when he is 100 per cent fit. I think we have not seen the best of Gundogan just yet. He can add something to any team.

"I have rarely seen a more intelligent player out there and who has better skills than Gundogan. I have no doubt that he would fit right in at Barcelona.

"He is a bit like a modern Xavi. He organises and dictates the pace of the game. He is probably already one of the best in the world in this aspect of the game."