Argentine website Olé reports that United are set to offer £25million for the 23-year-old midfielder.
Gaitan helped knock United out of the Champions League this season.
Gaitan joined Benfica from Argentine side Boca Juniors in 2010.
Argentine website Olé reports that United are set to offer £25million for the 23-year-old midfielder.
Gaitan helped knock United out of the Champions League this season.
Gaitan joined Benfica from Argentine side Boca Juniors in 2010.
