Ivory Coast captain Didier Drogba is understood to be out of the World Cup after breaking his right arm in a warm-up match against Japan.[LNB] Elephants coach Sven-Goran Eriksson was facing an anxious wait on Friday to discover the extent of Drogba's injury.[LNB]The Chelsea striker was forced out of Ivory Coast's World Cup warm-up game against Japan in Sion in the 17th minute and unconfirmed reports suggested the Chelsea star has fractured his right elbow.[LNB]If that were to be the case, Drogba would miss the finals which start next Friday in South Africa.[LNB]Eriksson said: "It's an elbow injury for sure. How bad it is, I don't know. He had a lot of pain."[LNB]Drogba went down clutching his arm following a challenge from Japan central defender Tulio shortly after giving the Elephants the lead.[LNB]"Of course I am worried, he's our captain and one of the best players in the world," added former England boss Eriksson, who attached no blame to Tulio.[LNB]"It was unlucky, he didn't want to hurt anyone. Football is a game of contact."[LNB]If Drogba were to be ruled out, it would be a devastating blow to Ivory Coast's hopes of qualifying from Group G which also contains Brazil, North Korea and Portugal.[LNB]Drogba has scored 44 goals in 69 appearances for his country and hit 37 for Chelsea in all competitions as Carlo Ancelotti's men landed the Premier League and FA Cup double last season.[LNB]Ivory Coast ended up winning the game against Japan 2-0 with Manchester City defender Kolo Toure adding a late second.