Benfica are prepared to sell Nicolas Gaitan when the window reopens.
The Argentine international has enjoyed a fine season for the Portuguese giants, including helping them knock Manchester United out of the UEFA Champions League.
And these performances have made him a key target for the Reds, with Sir Alex Ferguson sending scouts to keep tabs of the 23-year-old forward this term.
Reports suggest the Estado de la Luz club are prepared to sell Gaitan for £25million in the summer, but United could face competition from rivals City for the forward.
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