Hull City boss Iain Dowie believes Jozy Altidore, to fulfil his potential, must work harder in training. The 20 year old USA striker has headed back to Villarreal after scoring just once in his season-long loan with the soon-to-be relegated Tigers.

Dowie said: "The fans have been fantastic, given him great support and probably he hasn't fulfilled his potential here. He's got one goal and for the level of investment it's probably not enough.

"I've spoken to Jozy a number of times since I've been here and, if Jozy can train the way he plays, I think he's got a great opportunity but he needs to understand that it's that day in, day out.

"He's a lovely, laid-back boy and there's no side to him but he needs to focus on training at a better level.

"Kevin Kilbane keeps turning it out because he trains at that level, Nicky Barmby can keep playing because he trains at that level.

"It's a different level than Jozy's used to training at and he's got to get used to it. He found the physicality of the Premier League very hard when he came in. He's got used to that now but he must not get comfortable.

"You've got to stretch yourself every day in training. I said that to him and wished him all the best for the World Cup. I wouldn't be surprised if he had a good World Cup.

"He's got the right attributes if he can play to his strengths, and that is turning defenders and running at goal. He's a monster of an athlete but he's got to use that physicality, it's about imposing that.

"I've always felt the best part of a player's make-up is the two yards in his head. The (Teddy) Sheringhams, the (Alan) Shearers, the (Paul) Scholes, the (Ryan) Giggs, the (Wayne) Rooneys are two yards ahead of you in their head.

"Their football intelligence is bright and I think that's also something probably Jozy needs to work on."