Tomáš Koubek

Early football career in the Czech Republic

Koubek made his league debut for Hradec Králové in a 2–1 win against Mladá Boleslav on 30 April 2011. After Hradec Králové were relegated at the end of the 2014–15 Czech First League, Koubek joined Sparta Prague on a four-year contract, immediately going out on loan to Slovan Liberec for the 2015–16 season. In October 2016, Sparta Prague ordered Koubek to train with their women's team, stating "women belong at the stove" in reaction to a decision against him by a female assistant referee, Lucie Ratajová. He mainly started on the substitute bench during the 2017–18 Czech First League, but was later given preference in goal over his competitor, Slovak goalkeeper Martin Dúbravka.

Rennes

At the end of August 2017, Koubek transferred from Sparta Prague to Ligue 1 club Rennes for a four-year contract, becoming the club's second Czech goalkeeper after Petr Čech had played there between 2002 and 2004. He made his Ligue 1 debut in a 3-1 victory against Marseille on 10 September 2017.

Augsburg

On 6 August 2019, German side FC Augsburg of the Bundesliga announced the transfer of Koubek from Rennes on a four-year contract for an undisclosed transfer fee. On 19 June 2024, Augsburg announced that Koubek will leave the club upon the expiration of his contract on 30 June.

Slovan Liberec

On 11 January 2025, Koubek signed a contract with Czech First League club Slovan Liberec until June 2027.

In October 2015, Koubek was called up by coach Pavel Vrba to the Czech senior team. He debuted in a friendly match against Scotland on 24 March 2016, ending in a 0-1 defeat. Later, Koubek was included in the final 23-man squad for UEFA Euro 2016. Koubek was not initially included in the Czech squad for UEFA Euro 2020. However, due to Jiří Pavlenka suffering an injury, Koubek replaced him for the tournament.

As of match played 18 May 2024

Stade Rennais

Coupe de France: 2018–19 Czech Republic U19

UEFA European Under-19 Championship runner-up: 2011