Kolář transferred to Slavia Prague in 2018 with a worth €1 million, making him the most expensive goalkeeper signing in Czech First League history.

[3] During a Europa League match against Rangers on 18 March 2021, he was stretchered off with a fractured skull after a ducking into the boot of Kemar Roofe.

[4][5] The incident resulted in UEFA giving Roofe a four-match ban and Kolář being forced to wear a head guard for the remainder of his career.

[7] On 17 November 2019, Kolář debuted for the senior Czech Republic national team in a UEFA Euro 2020 qualifying match against Bulgaria.

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