United are coughing up around £750,000 to Fortaleza for the midfielder, who is due in Manchester in the coming days to finalise the move.
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Transfer expert Fabrizio Romano is reporting everything is settled and only forms now need to be signed.
Orozco has been likened to Chelsea midfielder Moises Caicedo and has been scouted regularly by United over the past 18 months.
The teen is primarily a defensive midfielder and will move officially to United when he turns 18 in July.