Krmenčík was born in Kraslice, Czech Republic, on March 15, 1993. He began his football career at the academies of his home town, and then moved to Banik Sokolov. The scouts at Viktoria Plzen were alerted to his talent, and moved quickly to sign him, initially for the club’s development squad.

In 2011 he was promoted to the first team and in April of the same year he made his debut in a game against Pribram. In the 2011-12 season, he was loaned out to Banik Sokolov, where he scored his first professional goal.

In the following four seasons, he went on loan spells at Zenit Czaslav, Vlasim, Banik Ostrava and Dukla Prague in the Czech leagues. He returned to Victoria in the second half of the 2015-16 season and his career began to gain momentum.

In nine games he scored three times, winning a place in the team’s starting XI. The opportunity he had been waiting for so long for came, and he made sure to take full advantage of it.

By January 2020, he managed to impress many in a Victoria shirt. In 124 games he scored 62 goals, served up 16 assists, and won a total of four championships, while he was also the league’s top scorer in the 2017-18 season.

A ligament rupture in the 2018-19 season kept him out of action for a long time, but on his return he remained impressive and his displays convinced Club Brugge of his potential.

In January 2020, the Belgians spent six million euros to make him their own. The adjustment was difficult for the Czech forward, who scored just three times in 19 games, also contributing three assists.

He has been a full Czech Republic international since 2016, and counts 26 appearances to his name, as well as nine goals. Previously he also represented his country at every youth level.