This overview shows all players whose contracts expire in the upcoming summer, sorted by their current market value.
www.transfermarkt.co.uk
Funny to look at lists like these of players that are objectively unwanted at their clubs because the vast majority are either just finished or terrible and simultaneously thinking “ah they’d be great for us, shame they wouldn’t even come on a free though”.
I’d definitely expect us to be looking at every player released by a PL level side or players probably <30 around Europe that you’d be able to make small profits on. Moneyball approach in a way but it’s the only choice we have.