Old Trafford youngster tears ligaments.
Manchester United’s on-loan winger Bebe has torn his anterior cruciate ligament ruling him out for the next six months.
The 21-year-old was sent to Besiktas this season to continue his development after struggling to make an impact last year, following his £7.4million move from Vitoria de Guimaraes.
He made just seven appearances for the Red Devils after manager Sir Alex Ferguson admitted never watching him play before he signed.
The Portugal U21 international injured his leg playing for his country against Slovakia U21s last night.
A statement on the Besiktas’ website said they had contacted United to discuss where the operation should take place.
“A scan has shown an anterior cruciate ligament tear to his left knee and he will be unable to play for six months,” the statement read.
“Surgery is required and we have contacted Manchester United and there will be a joint decision about where the operation will be done.”
Another injury concern for United is left-back Patrice Evra, who was forced to withdraw from the France squad with a knee injury.
The 30-year-old could miss the season opener against West Brom after being sent by to his club by Les Bleus, after calling up Manchester City new boy Gael Clichy to replace him.