The 22-year-old has played seven times for the Red Devils and has found the net twice since joining the club in August 2010 for a fee in the region of 7 million pounds. He has struggled to hold down a regular place in Sir Alex Ferguson's first-team due to the stiff competition at his position, though, which inlcudes Robin van Persie, Wayne Rooney, Javier Hernandez and Danny Welbeck.
The Scot feels the loan move will give Bebe a chance to play regularly, something that he can't get at Old Trafford and believes the move will give him the opportunity to progress as a player. He spent last season at Turkish side Besiktas.
“We feel the boy has got to get good experience at a better level than our reserve team," Ferguson told the club's official website. “He’s gone to Rio Ave who are fifth in the Portuguese league at the moment – they have a young coach [Nuno] who has a very good reputation.
“Bebe has done quite well in the last two or three months. He got a cruciate knee injury when he was on loan in Turkey last season and that derailed him for a bit. Coming back from these injuries takes time but he’s started to develop quite well.
"Hopefully his spell in Portugal, where he is from anyway, could help him.”