The out-of-favour former Portugal Under-21 international is heading back to his homeland on a temporary deal while Davide Petrucci has completed a switch to Royal Antwerp
The winger joins the Portuguese club on a temporary deal for the remainder of the 2013-14 campaign having struggled to break into the first-team set-up under David Moyes, and previous manager Sir Alex Ferguson.
Bebe joined Manchester United from Vitoria de Guimaraes back in 2010 although has only managed a total of seven appearances for the club in three years, and spent the last campaign on loan at Rio Ave.
Pacos de Ferreira are currently 14th in the Portuguese Primeira Liga having lost their opening three games of the season, while the club were also knocked out of the Champions League at the play-off round by Zenit following an 8-3 aggregate scoreline.
Bebe is not the only fringe player to leave Old Trafford on loan on deadline day, with Championship outfit Wigan Athletic completing a switch for England Under-21 star Nick Powell, while Davide Petrucci has sealed a move to Royal Antwerp.