Eric Djemba-Djemba may be forced out of Manchester United`s American trip after injuring his knee.
The Cameroon midfielder was plagued by knee problems in his first season at the club and the injury flared up again in Sunday`s win over the Ivory Coast.
Sir Alex Ferguson will have a reduced squad to choose from for games against Bayern Munich,
Celtic and AC Milan.
He is unlikely to use players from Euro 2004 and his South American players will be on international duty.
Djemba-Djemba, 23, lasted for only 43 minutes of Cameroon`s 2-0 World Cup qualifying win over the Ivory Coast in Yaounde.
The injury is the same problem that kept him out of the win over Libya last month.
