United winger Bebe out for six months

Bebe has played only seven first-team games for the Premier League champions (Getty Images)

Manchester United winger Bebe could be sidelined for up to six months after tearing his anterior cruciate ligament while playing for Portugal Under-21s in Slovakia on Tuesday night.

The 21-year-old joined United from Vitoria de Guimaraes for £7.4m in 2010, but has played only seven first-team games for the Premier League champions. He was recommended to Sir Alex Ferguson by his former assistant, Portugal national-team coach Carlos Queiroz.

In June, United agreed a one-season loan deal for the player with Besiktas. The Turkish club have contacted United to discuss where his operation should take place.