Ghana's German-born midfielder Kevin-Prince Boateng will not succumb to provocation when Germany play his side in Wednesday's crucial World Cup clash, insists his coach Milovan Rajevac. Boateng was born and raised in West Berlin, but the 23-year-old Portsmouth star has opted to play for the country of his father, despite representing Germany at junior level. It was his tackle on Chelsea star Michael Ballack in the FA Cup final which ruled the Germany captain out of the World Cup, but Ghana coach Rajevac, who is from Serbia, says Kevin-Prince will not respond to any jibes from the Germans. His half-brother, Jerome, is in the Germany squad and the pair have feuded in the wake of the tackle on Ballack, but personal matters will be swept aside at Soccer City with a place in the Round of 16 at stake, insisted Rajevac. Germany must win the game to be sure of reaching the knock-out phase. 'Kevin-Prince will be focused and will not be provoked, he is a professional, they are brothers, but that will be forgotten once he gets on the pitch,' insisted the Serb. 'He will only be thinking of getting an appropriate result for his side.' On Monday, Jerome called for calmer minds to prevail, but raised the ante for Wednesday night by saying he still has no intention of talking to his half- brother. 'He remains my brother and I wish him the best, but at the moment we have nothing to say to each other,' said the 21-year-old, who is set to make his English Premier League debut next season with Manchester City. With hosts South Africa, Nigeria and Cameroon already out, Ghana are on the verge of being the only African nation in the World Cup's knock-out stages. While Rajevac insists his side will not feel the pressure of the continent's expectation, neutrals in the Soccer City crowd are sure to be supporting the Black Stars. Germany's defeat to Serbia last Friday blew Group D wide open and with all four teams still in with a chance of qualifying, Rajevac says his side are just focused on beating Germany. 'Before the tournament, we thought the situation would be quite different, but Germany's defeat to Serbia has made it complicated,' he said with Australia taking on Serbia in Wednesday night's other Group D game. 'We have a good side, but we know Germany are very strong, but we will not change our style, we will play in the way we are used to playing. 'The match can be broken down into a simple formula: if we win, we go through, if we lose, we could go out.' Germany striker Miroslav Klose is suspended for the Ghana game after being sent off against Serbia, but Rajevac says the pressure on Germany will weigh heavily as they have never failed to reach the knock-out phase at a World Cup. 'I think the loss of Klose will change their tactics, but they are a strong football power and I am sure they will be at full pace until the last minute of the game,' he said. 'The only thing I would say is that they might have a few psychological problems as there is a lot of pressure on them, but we will have to see how that reflects out on the pitch. 'They are a world powerhouse and we will be taking nothing for granted.' 