"He has got a good head and he is really determined to make it to the top level, play for Scotland many times and be the top man. He works very hard (and] does extra training sessions after team sessions. He has got the right amount of arrogance and self-belief without being big-headed - he is a social guy in the dressing room as well.
"He has got all these assets that a good top-class player needs. To be a top striker you need to be selfish and you need to be arrogant - let no-one bully you. He has got that, which is great. Hopefully, it carries him far."