[citation needed] Although between December 2016 and February 2017 he appeared in 6 of Pescara's 10 matches (out of 2 due to a minor injury), rumours have surfaced about disagreements with some of his teammates and consequently, he was removed from the squad by club's disciplinary action in mid-February.

He revealed these claims in an interview on 21 March 2017, in a national team camp in Senec, Slovakia, prior to the FIFA World Cup qualifier against Malta.

[15] He was selected in Slovakia's squad for UEFA Euro 2016 and made his first appearance at the tournament as a substitute for Viktor Pečovský in the team's final Group B match – a 0–0 draw with England.

[18] He managed to make a national team comeback in October 2019 for a qualifier against Wales, when it was required to fill the role of a second centre back, as Denis Vavro had suffered a yellow card suspension.

After the arrival of Francesco Calzona, Gyömbér was first nominated in March 2023 to kick-off UEFA Euro 2024 qualifying short after a three-month injury-caused absence from club football.