Arjen Robben's late arrival at World Cup boosts Holland

Arjen Robben arrived in Johannesburg to give Holland a World Cup boost as they prepare to face Denmark on Monday . However, the Bayern Munich winger is unlikely to be risked in that game as he continues his recovery from a hamstring injury. Robben suffered the setback in a warm-up match against Hungary and remained in Holland to receive treatment. After Denmark, the Dutch take on Japan and finally Cameroon in Group E. Arsenal striker Robin van Persie believes they have every reason to feel confident going into the tournament. "We should reach the semi-finals at least," he said. "That's a must for us, especially when you look at the 23 players and the clubs they play for." Meanwhile, Cameroon's coach Paul Le Guen has revealed that the regular goalkeeper Idriss Carlos Kameni and midfielder Alex Song are likely to be left out of the team for their opening World Cup game against Japan in Bloemfontein on Monday . "We've had three weeks of hard training and I have a better idea of my team now," he told a news conference in Durban today . "Alexandre Song may not start the first match against Japan. This does not mean there is anything bad about him. He is a great player. It's just that I want to start the tournament with the most competitive team," the Frenchman explained. Le Guen's comments came after an hour-long training session for the Group E match, before which he held a 15-minute discussion with the Arsenal midfielder, which attracted media attention. He also said he would be installing 36-year-old Hamidou Souleymanou as first-choice goalkeeper, a major surprise given Kameni has been Cameroon's undisputed goalkeeper over the past seven years. Le Guen gave no reason for the decision and did not name any more changes, but public opinion in Cameroon has blamed Kameni for conceding too many "easy goals". They hold him, together with the ageing Geremi and former captain Rigobert Song, responsible for the team's quarter-final exit in the African Cup of Nations in Angola in January. Le Guen spoke at the news conference about his confidence of a win, even though Cameroon have not won any of their past seven matches. "I have watched many videos of Japanese football, over and over, and I know their strongest weapon is that they have very swift attackers," he said. "We've worked very hard to deal with that and, as concerns Monday's match, I'm full of confidence." His optimism was shared by the defender Sébastien Bassong, who accompanied Le Guen to the news conference. "We are professional footballers, we are used to playing against swift attackers like those from Japan. So they will not pose any problem because we are ready to cope with their style," said Bassong.