Antonio Jose Leite, who works as communications director for the Portuguese second-tier club, said Oliveirense may not receive significant compensation for Amorim.
A source has told ESPN FC that Amorim has been on trial at Old Trafford and Portuguese news agency Lusa quoted a source as saying a deal is "90 percent done" and that the 19-year-old "could have a great contract in front of him".
Manchester United are on the verge of signing 19-year-old Portuguese winger Bruno Amorim from Portuguese side Oliveirense.
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Leite also confirmed that United will not be paying much in the way of a transfer fee as part of the deal for Amorim. The contract will shortly be announced, but he is a future bet at United. Mourinho has already see the Red Devils bring in three new faces to the squad so far. These details are not yet defined.
Links remain with more senior signings such as Serge Aurier, Danny Rose, Gareth Bale and Ivan Perisic, with Mourinho admitting he'd like one more addition to his first-team before the end of the transfer window. But the training rights and future sales of the player are guaranteed gains'.
The Belgium global and the Serbian midfielder arrived at Old Trafford from Everton and Chelsea respectively. The duo's Premier League experience will be vital for Mourinho and United in the 2017/18 season.