Former Newcastle striker Papiss Cisse is convinced by the ability of Alexander Isak.
Cisse admits he's a fan of the Sweden centre-forward.
He told ChronicleLive: "He's a proper striker.
"He's good with the ball and he moves very well. He can be a big striker and I hope the club try to keep him. He's finding space in the club and on the pitch. He looks happy there.
"If a striker is doing this on the pitch and they're scoring, this guy is happy where he is now. I would say to him to continue what you are doing. He can become a big striker because he has everything."
