El Mundo Deportivo reports that United plan to rival Chelsea and Manchester City for the signature for the Benfica star.
Oliveira is currently on loan to Deportivo la Coruna from Benfica.
The 21-year-old has scored two goals in four La Liga games for Deportivo la Coruna this season.
Oliveira’s current contract with Benfica is set to expire in the summer of 2017.
