Cotterill gave the striker his first pro deal while at Burnley.
He told the Daily Echo: â€œI first saw Jay when he was playing in Burnleyâ€™s youth team and he was about 15.
â€œHe was quite a tall, skinny boy and hadnâ€™t really filled out.
â€œI thought straightaway he had promise and brought him straight in to train with the first team and he fitted in very comfortably. He has always been a fantastic boy, very level headed, always wanted to learn.
â€œJay wants to be a really good player and he is prepared to work hard to achieve that. He would always stay back after training to work on things and he has always struck a lovely ball and always been a threat in the air with really good heading ability.
â€œI always had a gut feeling from the first time I saw him that Jay was going to make it to the top level and do well there.
â€œRight now he will be finding there is a step up in level but Jay will play in the Premier League regularly and do very well."