→International career: From what I read, the source from Aktualně.cz only mentions Souček improving the Czech midfield squad rather than actually stating his debut.
Souček appeared in all three matches of the [[Czech Republic national under-21 football team|Czech Republic under-21 team]] in the [[2017 UEFA European Under-21 Championship|2017 UEFA Under-21 Championship.]]<ref>{{Cite web|url=https://repre.fotbal.cz/hrac/hraci/4057|title=Tomáš Souček {{!}} Reprezentace|website=Football Association of the Czech Republic|access-date=2 July 2017|language=cs}}</ref>
After representing the Czech Republic in several youth categories, Souček made his debutdebuted for the [[Czech Republic national football team|senior sideteam]] on 15 November 2016 in a [[Exhibition game#Association football|friendly match]] against [[Denmark national football team|Denmark]].<ref>{{Cite news|title=Česko 1-1 Dansko|trans-title=Czech Republic 1-1 Denmark|url=https://sport.aktualne.cz/fotbal/fotbalova-reprezentace/zive-cesko-dansko-uspeji-cesi-v-pratelaku-proti-severanum/r~c305afcca68111e68cd20025900fea04/|website=Aktualně.cz|publisher=[[Economia]]|date=15 November 2016|access-date=19 March 2022|language=cs}}</ref> He made his competitive debut on 10 June 2017, in Czech Republic's 1–1 away draw against [[Norway national football team|Norway]] in a [[2018 FIFA World Cup qualification (UEFA)|2018 World Cup qualifier]].He debuted for the senior side on 15 November 2016 in a [[Exhibition game#International football|friendly match]] against [[Denmark national football team|Denmark]].<ref>{{Cite news|first=Michal|last=Kovalčík|title=Česko 1–1 Dansko: Přátelské zápasy {{!}} mezistátní|url=https://www.eurofotbal.cz/pratelske-zapasy/mezinarodni/2016/reportaz/cesko-dansko-474045/|website=Eurofotbal|date=15 November 2016|language=cs|quote=Do druhého poločasu poslal Karel Jarolím většinu zbývajících hráčů na lavičce náhradníků, svůj první start si tak připsali brankář Jiří Pavlenka a záložníci Petr Mareš s Tomášem Součkem.|trans-quote=As Karel Jarolím sent most of the remaining players on the bench in the second half, goalkeeper Jiří Pavlenka with midfielders Petr Mareš and Tomáš Souček got their first start.}}</ref> He made his competitive debut on 10 June 2017, in Czech Republic's 1–1 away draw against [[Norway national football team|Norway]] in a [[2018 FIFA World Cup qualification (UEFA)|2018 World Cup qualifier]].<ref>{{Cite news|title=Vpředu se Schickem, návrat Sivoka. Fanoušci proti Norsku věří i Součkovi|url=https://www.idnes.cz/fotbal/reprezentace/sestava-ctenaru-pred-fotbalovym-zapasem-norsko-cesko.A170609_101137_fot_reprez_pes|website=Mladá fronta Dnes|date=10 June 2017|language=cs}}</ref>
On 24 March 2021, Souček scored a [[hat-trick]] in a 6–2 [[2022 FIFA World Cup qualification (UEFA)|World Cup qualifying]] win against [[Estonia national football team|Estonia]].<ref>{{cite web|url=https://www.bbc.com/sport/football/56516156|title=Estonia 2–6 Czech Republic: Tomas Soucek scores hat-trick in comfortable win|publisher=BBC Sport|date=24 March 2021|access-date=24 March 2021}}</ref>
