Chennai, March 1: Filmmaker Krishna Vamsi has decided to delay the shoot of his upcoming Telugu horror-thriller "Rudraksha", which was set to go on the floors from June, in order to immediately start work on actor Nandamuri Balakrishna's 100th film. "Krishna Vamsi has been roped in to direct Balakrishna's 100th film. Although he was supposed to finish 'Rudraksha' first, he has apparently postponed it to start work on Balakrishna's film. The pre-production work is already underway," a source close to Krishna Vamsi told IANS. Nearly five directors were vying for the opportunity to direct Balakrishna's 100th film. "Krishna Vamsi has been planning to work with Balakrishna for a very long time. He even readied a script long back and when it was narrated to Balakrishna last month, he immediately expressed his interest to work in the film," the source said. The project is most likely to go on the floors from May.