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Published 11:20 28 Jun 2016 BST
Updated 11:29 28 Jun 2016 BST
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Mason plays for Wolverhampton Wanderers, and has featured for Ireland at U-19 and U-21 levels, qualifying for Ireland through his mother who was born in Mayo.
He joined Wolves from fellow Championship side Cardiff City in January, and scored three goals in 16 games.
"I'll have a little look (at Mason) again," O'Neill said.
"Sometimes it's difficult to make a judgement on a player who is playing a couple of leagues below as to whether they could step up and do a job with this intensity at the minute."

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