It's kind of too bad that UEFA reorganized when they introduced the Conference League, it was nice to watch Rijeka in the Europa league when they made it. Now 1st in Croatia goes into the CL and 2 & 3 go into a qualifying round for the Europa Conference League. Rijeka is in a tough fight this year, they've finished 3rd a few years in a row and 2nd recently, currently tied for 2nd place with Osijek and Hajduk Split (more of a traditional power) is in 4th 2 pts behind with a game in hand.
The Croatian League usually start up in mid-summer, so if anyone is there on vacation in August you can catch a game. Beautiful country