EintrachtFrankfurt is doing very well in Europe, but it does not want to succeed in the competition yet. seems to be a matter of time though. If you can win the Eruopa Leagie, and progress to the group stage of the Champions League, you should also be able to easily finish among the top 5 teams in the competition. There are a few teams that have better players based on individual quality, but last year Frankfurt proved to be a close-knit team that was very difficult to beat. All teams play for a maximum of 2nd place, Bayern Munich is from another planet in this competition.
But reflecting on last season I feel they will still carry out the same strategy by sacrificing one of the leagues and focusing on one of them like when they didn't pay much attention to the bundesliga and winning the Europa League last season.
At the moment their opponents in the knockout phase are quite difficult to beat because Napoli's performance has been very good so far both in the domestic league and in the Champions League so I think this is good enough for Frankfurt and they have to focus more on their bundesliga this season.