"I am very happy to join Manchester United, " said the youngster, who will miss the club's pre-season tour of the Far East because of an injury.

BBC: Obertan completes Man Utd switch

Midfielder Steven Gerrard, who missed the Reds' Far East pre-season tour in order to attend a court case, will not join up with the club for the Singapore game despite being found not guilty of affray.

BBC: Skrtel injury worry for Liverpool

"He will not be available until December or January, " said United boss Sir Alex Ferguson ahead of the club's pre-season tour of the Far East.

BBC: Man Utd suffer Park injury blow