Callum Elder's shot at a first international cap for Australia is in jeopardy due to injury.
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Mason, 27, retired from football in February last year after he fractured his skull while playing for Hull City against Chelsea in January 2017.
Leeds United returned to the top of the English second tier with a 1-0 victory over Hull City on Tuesday.
Aston Villa full back Alan Hutton wrapped up a 3-1 come-from-behind win at Hull City with a mazy dribble and clinical finish to seal the points.
United States international defender Eric Lichaj completed his move to Hull City from Nottingham Forest on Friday.
Nottingham Forest's United States international defender Eric Lichaj is closing in on a move to Championship rivals Hull City, sources say.
Hull City forward Adama Diomande has joined Major League Soccer side LAFC, the club announced on Wednesday.
Steve Bruce's first return to Hull ended with the former Tigers boss having to share the points from a 0-0 draw with his Aston Villa side.
|West Bromwich Albion||16||9||6||1||+12||33|
|Preston North End||16||9||4||3||+14||31|
|Queens Park Rangers||16||7||3||6||-4||24|