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United invited Christie to work at their Thorp Arch training complex earlier this season in an attempt to help him win his long-running battle against injury, but boss Gary McAllister has confirmed that he is now seriously considering adding the 29-year-old forward to his squad.

Christie's spell at Thorp Arch was not originally intended to be a trial but he has featured in a number of Leeds' reserve-team fixtures and played in a behind-closed-doors friendly against Nottingham Forest on Tuesday.

The former Middlesbrough and Derby County player has been without a club since the summer of 2007 and has not made a first-team appearance for 19 months, but he came close to winning a short-term contract with Leeds last season before a back injury prevented the deal.

McAllister said: "We're looking at him very closely now.

"He's had an opportunity, he's played a few games and he's fit. It's getting to a stage where there might be a decision to make.

"He's one player who's making me think and he's proven at the highest level.

"It's not that long since Middlesbrough were talking about paying £7m for him. I'm paying a lot of attention to him at the moment."