So, if you made at least 5 appearances, you get a medal automatically. If you didn't make 5 appearances, you have to wait until all the players who did get their medal. If there are any left over at that point, the club can decide to give you one.

Apparently Dowman, Nwaneri and Norgaard automatically get medals because they had 5, 6 and 6 sub appearances, respectively. Nobody else made more than 1 but fewer than 5 sub appearances. There are a total of 24 players who get medals this way, leaving 16 extra medals. I guess Kepa will get one, even though he didn't make any PL appearances.

My guess is that the rest will go to coaches / staff. There are other players who played a bit this season in other competitions, players like Marli Salmon, Andre Harrington-Annous, etc. But, I don't think they contributed enough to the PL victory compared to say Nicolas Jover. Maybe Per Mertesacker? I wonder if anybody who isn't at the club anymore will get one. Edu? Carlos Cuesta? Maybe an outside shot for an important former player like Granit Xhaka?