Triple road race world champion Peter Sagan requires heart surgery which could endanger his bid to qualify for the Paris Olympics mountainbike race in summer. Sagan, 34, reportedly underwent a first operation recently but that was never confirmed. He now said on Instagram that “while I was training on the rocky trails in Marseille, my heart hit a few bumps. “Nothing to worry about, you could say that my heart needs a pit stop. I will undergo surgery next week and thanks to my friend, sports cardiologist Dr Roberto Corsetti, I am sure I will be back in the saddle very soon,” he said. Sagan ende…