"The club has spoken about his potential before I got here but Haris has been so unlucky," his manager said. "In the 45 minutes he played on Tuesday night, he couldn't have shown more quality than he did.
"He has got to produce the energy and power the Premier League demands. If he can do that, we are going to have a player on our hands.
"In the three years I have been at Newcastle. I've never really had the chance to play him. When he has been fit, I think he's just been beneath the best team. He's had a good start."