The American forward, signed from Werder Bremen in the summer,
"I hope it isn't weighing on him," he said. "Since I have been here he has played as a wide forward. At half-time in the Southampton game he pretty much helped change the performance. His work rate is there for all to see.
"There was an early chance in the Wolves game he put over and he would be disappointed with the chance he had at the far post against Newcastle.
"If he keeps working hard the rewards usually come. He is a really diligent lad who works hard every day. He understands the game and you can see that there's a want and a need to go and score that first goal and, once he does, I am sure he will be flying.
"I saw him play for Werder Bremen as well as America before I came to the club. I've seen Josh a few times. His work ethic is right up there and it's something that you come to expect from American players anyway. They have a huge work ethic.
"Tactically he is obviously learning the game because he is still a young player. But when he came off the bench against Southampton he made an impact and that is what we want. We want them to make an impact and change games."
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