Czech Prime Minister caught complaining he might have to go to Mandela's funeral Jiri Rusnok made faux pas as he chatted to defence minister He was in line to go to South Africa as President has knee injury Rusnok apologised after using a vulgar term in frustration Many world leaders have said they wouldn't miss Nelson Mandela's funeral for anything, but Czech Prime Minister Jiri Rusnok isn't among them. Rusnok's conversation with Defense Minister Vlastimil Picek in parliament on Friday was broadcast by the Czech public television news channel and quickly went viral. When Picek reminded him that President Milos Zeman might be unable to fly because of a knee injury, Rusnok reacted with a vulgar term and then, addressing his companion by the Czech equivalent of 'dude', said: 'I'm dreading that I will have to go.' Is this thing on: Czech Prime Minister Jiri Rusnok's (centre) conversation was broadcast by the Czech public television news channel Oops: Jiri Rusnok, Czech Prime Minister, was caught expressing his irritation at the prospect of going to Mandela's funeral. He complained that he had other plans - a lunch and a dinner- and that a South Africa trip would be too long. The recording became widely popular in local media Saturday and on the Internet. 'I apologise for those words,' Rusnok said in a statement sent to The Associated Press via his spokeswoman Jana Jaburkova on Saturday. 'It wasn't right to use such terms in connection with the death of Nelson Mandela.' Rusnok said it would be difficult for him to find time for unexpected events in his busy December schedule. He added it will be decided in the next few days who will represent the Czech Republic at Mandela's December 15 funeral. Rusnok swore and said: 'I'm dreading that I will have to go.' Loss: The world went into mourning after Mandela died on Thursday Mandela visited Prague in 1992 to meet with then-President Vaclav Havel who had led the 1989 Velvet Revolution that ended 40 years of communism in his country. The two leaders had both spent years in prison for opposing repressive regimes before becoming presidents. They reportedly became good friends. Havel died in 2011. Czech Foreign Affairs Minister Jan Kohout will travel to South Africa to attend the memorial service for the late president on Tuesday, ministry spokeswoman Johana Grohova said.