I am really sorry for Chiesa that he could not make the champions league squad with Liverpool, although he has really declined in form. He is a player I really admired during his days a Juventus, but since he came to Liverpool he has been a shadow of himself, maybe because of the injury he had some years back.
I think the best thing for him is to try to secure a move away from Liverpool, maybe in this transfer market or in January. He might just find his form somewhere else and begin to play and enjoy himself agaim.
His opportunity is to show his best performance in the Premier League. He has always been a choice when at Juventus, but at Liverpool, he has to compete for a place in the squad.
In 3 matches in the Premier League, he still gets a chance even as a substitute. There must be considerations regarding his performance, which is why he was not included in the squad list for the Champions League. This will certainly determine his future career at Liverpool. Perhaps he will get on another team.