Frank admits the young striker needs to be playing consistently to reach his potential and admits that may be difficult to find at Spurs.
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He explained, "I think with Dane, first of all, I think he's a great player. I think he's a fantastic finisher. He finishes at a very, very high level, left and right foot.
"I think probably he needs the bits that every player needs. He needs to play minutes and games. That's the biggest thing and right now the competition is tough here.
"And to be able to give him, let's say, three, four, five games in a row is probably a little bit difficult. It's never impossible, but it's a little bit difficult. So, for me, he needs to play games."