[6] Krejčí was part of the Czech Under-19 team that finished as runners-up in the 2011 UEFA European Under-19 Championship.

[7] On 6 November 2012, Krejčí received his first Czech senior team call-up by coach Michal Bílek to face Slovakia in Olomouc,[8] He won the ball from the inconsistent Slovak defender Peter Pekarík in the penalty area, resulting in a 3-0 victory for the Czechs.

[10] On 6 February 2013, Krejčí scored his first goal in a friendly match against Turkey, resulting in a 2-0 victory.

[11] On 22 March, he started in the 2014 FIFA World Cup qualification match against Denmark, where the Czechs lost 0-3.

This biographical article related to association football in the Czech Republic, about a midfielder, is a stub.