The FourFourTwo portal has devoted an article to clubs that once won their national championships without suffering a single defeat. It's nice to note that Dynamo Kyiv is on the list.
"Under the leadership of former striker Serhiy Rebrov, Dynamo Kyiv completed a home double in the 2014/2015 season without losing a single match. "Dynamo won the Ukrainian Premier League title, 10 points ahead of Shakhtar Donetsk (20 wins and 6 draws in 26 games). The White and Blues also beat Shakhtar on penalties in the final of the Ukrainian Cup," the article says.
The full list of unbeaten clubs:
1. "Ajax (1994/1995 season)
2. "Bayer Leverkusen (2023/2024 season)
3. "Arsenal (2003/2004 season)
4. "Porto (2010/2011 season)
5. "Juventus (2011/2012 season)
6. "AC Milan (1992/1993 season)
7. "Celtic (2016/2017 season)
8. "Dynamo (2014/2015 season)
9. PAOK (2018/2019 season)
10. "Real Madrid (season 1931/1932)
11. "Steaua (1986-1989 seasons)
12. "Besiktas (1991/1992 season)
13. "Peñarol (seasons 1948/1949, 1953/1954, 1963/1964, 1966-1968, 1974/1975, 1977/1978)
14. "Benfica (1972/1973 season)
15. "Red Star (2022/2023)
16. "Preston (1888/1889)