Sebastien Reichenbach believes controversial rival Gianni Moscon deliberately caused the crash that left him with a broken elbow.
Switzerland's Reichenbach was felled during Tuesday's Tre Valli Varesine in Italy and will file an official complaint against Team Sky's Moscon, who was banned for six weeks earlier in the season after admitting racially abusing Reichenbach's teammate Kevin Reza.
"It was intentional," Reichenbach told Swiss newspaper Le Nouvelliste regarding the crash.
"Several riders saw the action and are ready to provide testimony on my behalf. He deliberately threw himself against me. On a descent, the accident could have had even more serious consequences. My team, FDJ, has encouraged me to file a complaint. They will support me."
Moscon responded in La Gazzetta dello Sport: "It's not true. It's nothing to do with me. We were on a section of rough road and Reichenbach's hands slipped from his handlebars. I've never spoken to him in my life."
PA contributed to this report