Newly-promoted Premier League side Wolverhampton Wanderers
The 21-year-old joined the English outfit from Porto last year, coming in for a reported club-record fee of £15.8m.
His exploits in the Championship last season saw Wolves return to the top flight at the end of last season and he has since agreed a new deal with the club, which they announced via their official website on Monday.
Wolves sporting director
“Ruben has been an absolutely outstanding addition to the squad since his arrival last summer and is thoroughly deserving of his new deal,” Thelwell declared.
“It is no secret that there has been interest from other clubs, but Ruben is very mature for his age, incredibly level-headed, and loves being a part of the Wolves family.
“He and his young family have settled very well in the area and he was very keen to continue his journey with Wolves into the top flight and beyond.
“Ruben has taken everything in his stride since joining us, and I am positive he will continue his form into next season and have a huge impact on the Premier League.”