Coci qualified for the men's 200 m butterfly at the 2012 Summer Olympics in London, by eclipsing a FINA B-standard entry time of 1:58.42 from the European Championships in Debrecen, Hungary. He challenged seven other swimmers on the second heat, including former semifinalist Hsu Chi-chieh of the Chinese Taipei. Coci cruised to fifth place by 0.02 of a second behind Ukraine's Illya Chuyev in 1:59.67. Coci failed to advance into the semifinals, as he placed twenty-ninth overall in the preliminaries.