McDonald played with Paul Gascoigne at Newcastle United.
He told whufc.com: "I've stated before that he first came in from Manchester United thinking he could walk into the team, which would be very difficult because we have some very good players at the football club. He didn't really come into the mould, which is why we sent him out on loan, to play some games.
"He came back for this pre-season with a fantastic attitude, really focused on what he's doing and he has been accepted into the crowd. When you have the skill and ability in the final third, which everybody is looking for, then you've got one hell of a player. You need the players around him to pull and push him and I think certainly Mark Noble and Kevin Nolan, who have played the majority of games with him in the middle, have been a fantastic influence on him.
"He's been able to express himself when he's on the ball and we just need the end product. He did that in pre-season and he just needed to bide his time to get into the team. He's there now and he's producing, which is fantastic."
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