Slovakian attacking midfielder Ondrej Duda joined Norwich City on loan from German side Hertha Berlin on 12th January 2020. He made his Norwich debut starting in the 1-0 home win over Bournemouth on 18th January 2020.

Duda began his football career at his hometown club MFK Snina before moving to fellow Slovakian side Kosice where he rose through the youth team ranks to make his debut aged 17 against Slovan Bratislava.

After 33 appearances and five goals, he chose not to renew his contract and moved to Polish side Legia Warsaw in February 2014. He made 67 appearances for Legia, scoring 10 goals. During this time he was first capped by Slovakia at full international level, having played at Under-19 and Under-21. His international debut was against Finland in November 2014. His first international goal came against Wales.

On 20th July 2016 he moved to German side Hertha Berlin on a five year deal. His start in Berlin was sidelined by a knee injury but he had a prolific 2018/19 season, scoring 11 goals in 32 Bundesliga games. His form saw him linked with Sevilla. 2019/20 was less successful and he fell out of favour with new manager Jurgen Klinsmann who allowed Duda to join Norwich on loan, He had played 70 games for Hertha, scoring 13 goals.

Duda made 12 appearances for City (10 in the Premier League) before returning to Hertha Berlin on 13th July 2020 following Norwich's relegation to the Championship, Daniel Farke explained "“We were in talks in the last few days and we will allow him to do this because I think for all parties it is the right decision for him because in Germany they are already three weeks into the summer break and pretty soon they will start their pre-season. I think it also makes sense for him to be back and have a bit of rest because most of the clubs in Germany start in the beginning of August or even in late July for their pre-season. But also for us right now relegation is confirmed so it’s more like even if he would have some game time it’s not like we can save the world anyhow and it’s also a bit more chance for game time for the players who will be here during the next season, so I think it’s a good decision. We also allowed this because his behaviour was always unbelievably professional, he’s a top bloke and I think for that we allowed his wish, and also Hertha Berlin’s wish. We wanted to show some class because he also showed in his behaviour some class, because he was always there, a top professional, always there in a good mood. Of course he would have preferred to have even more game-time and to have won more games."

On 16th Spetember 2020 he transferred to FC Koln for a fee of €7 million with Jhon Cordoba moving in the opposite direction. For Duda, the move represents a fresh start for his career following disappointing spells with Hertha and City.“I am very happy to be here. FC Koln is a club that I know well with its fans from the Bundesliga. It’s an exciting challenge for me. I will give everything for the club,” said Duda..

On 29th January 2023 he was loaned to Italian side Hellas Verona for the remainder of the season. This was made permanent at the end of the campaign.