Bero began his professional career at AS Trenčín, where he went through all the youth categories, playing as a defender.[1] Bero debuted for the senior side on 21 July 2013 in the Corgoň Liga match against Spartak Trnava, where his club lost 1-2.[2][better source needed]
During the 2014–15 Slovak First Football League, Bero won the Slovak Football Cup with AS Trenčín in the final against FK Senica, where the match was decided in a penalty shootout.[3] He also became the champion of the Fortuna Liga and celebrated winning a double.[4]
In the 2015–16 Slovak First Football League, Bero scored his first hat-trick on 27 September 2015 against MFK Skalica, where Trenčín won 3-0.[5] Near the end of the season, he defended the double with his team.[6]
On 3 July 2018, Bero agreed to join Eredivisie club Vitesse on a four-year contract.[8] On 18 November 2021, he extended his contract at the club until 2023 with an option for another year.[9]
VfL Bochum
On 27 June 2023, Bero signed a three-year contract with Bundesliga team VfL Bochum.[10] After just seven minutes during the match against Borussia Mönchengladbach on 30 September, in which Bochum lost 1-3, he suffered from a knee injury that would rule him out for several weeks.[11] On 20 January 2024, Bero made a comeback with his first goal in a 1–0 league victory against VfB Stuttgart.[12]
International career
Having represented various Slovak youth teams, Bero debuted for the senior side in a 3–1 friendly victory over Georgia on 27 May 2016.[13] He was omitted from the final 26-man squad for the rescheduled UEFA Euro 2020.[14]
On 10 January 2022, Bero and his partner, Klaudia Fraňová, were announced to expect a child.[17] Their daughter, Matea Tanya, was born on 16 May 2022.[18]