Sanches has two caps for Portugal and was watched by United scouts this week in the friendly with Belgium yesterday.
He has a £60m buyout clause on a deal that runs until 2021
And United will face competition from Real Madrid, Bayern Munich and Barcelona.
GETTY
Renato Sanches is on Manchester United's radar
Jurgen Klopp has discussed transfer target Mario Gotze.
Gotze is on Klopp's radar this summer and the Reds could launch a move for the Bayern star when the transfer window opens.
And Klopp has admitted he has 'extraordinary abilities'.
"I am happy that he put in a good performance yesterday but there is nothing to add from my side," Klopp said.
"He's a player with extraordinary abilities and wants to return to full fitness after four months on the sidelines."
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Mario Gotze - Spotlight on
Arsenal could lose Hector Bellerin to Manchester City after it emerged the right-back is wanted by Pep Guardiola.
Bellerin has had an exceptional season for Arsenal and has been linked with a return to Barcelona.
But now City are also in the mix, according to reports in Spain.
Guardiola will overhaul the City squad in the summer when he replaces Manuel Pellegrini.
And Spanish outlet El Confidencial report that Bellerin could be in line to replace Pablo Zabaleta or Bacary Sagna.