[1][2] In 2011, Krmenčík was promoted to the first team and in April of the same year he made his debut in a game against Příbram.

In the following four seasons, Krmenčík went on loan spells at Zenit Čáslav, Vlašim, Baník Ostrava and Dukla Prague in the Czech leagues.

[5] On 5 January 2021, PAOK announced that they reached an agreement with Club Brugge for the loan of Krmenčík until the end of the 2020–21 season.

[6] On 22 May 2021, Krmenčík scored in the last minute of Greek Cup Final, sealing a 2–1 win against league champions Olympiacos.

[11] In 2016, Krmenčík received his first call-up for the Czech senior squad in a UEFA Euro 2016 qualifying match against Norway on 11 November,[12] which he also marked his debut with an opening goal.