The midfielder joins from Middlesborough's under 23s on a one month loan deal, writes Tom Feaheny.
"Alex has been at Middlesbrough for ten or eleven years and is very, very highly thought of. I believe he will have a really big future in the game at a higher level," Gray told York City's website.
"He is a very attacking minded midfield player and he has got a goal in his game, for sure. We have known about him for a long time."
Pattison hasn't played many games this season due to injury, with Gray thinking the move works for all parties.
"He's just come back from injury so I think it will benefit everybody. He will get the game-time that he needs and he will get the senior football that Academy players at that age need to experience."
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