It is being reported that the attacking midfielder would cost United around £20million, as the youngster have just signed a new contract with his club Gremio.
It is believed a move for Douglas Costa could put Carlos Tevez’s future at Old Trafford into doubt.
United will have to pay £30million for Tevez at the end of this season if they want to sign him permanently, something the club could struggle to do, due to the financial squeeze.
