Schleck criticized race organizers for their decision to use daunting cobblestone sections this month, making the demanding course even tougher.
Several riders crashed during the early stages, including Schleck’s brother Frank, who had to pull out last week because he broke his collarbone while falling on the cobbles.
“It’s too dangerous. It’s my brother who fell, but that’s not why I’m saying it,” Schleck said. “It was my opinion before the Tour, and it still is.”