On 7 April 2015, Venkov scored his first goal for Cherno More in the 48th minute of a Bulgarian Cup match against Lokomotiv Plovdiv. Cherno More won 5–1. Having been appointed vice-captain for the 2014–15 season, Venkov was promoted to club captain after the departure of former captain Kiril Kotev in May 2015. On 23 May, Venkov signed a one-year contract extension with Cherno More until 30 June 2016. A week later, he received his first major honor with the Sailors, as he captained the team that eliminated Levski Sofia 2–1 in the 2015 Bulgarian Cup Final.