from my experience, with non Locked players, it is a combined total of 40(like in the Majors). When Drafting, with an already Full roster, be careful of whom is dropped as part of Attrition! A tip, Trade-in your non essential “players” beforehand, just to make room and gain a benefit for EVO building.
Also as your team evolves and you acquire “special players”,I.e. legend or prime players,those do not count against your roster.so,you can carry even more players.but Andrew is correct in his comment about autodrop players when the roster is at max.
Answers
When Drafting, with an already Full roster, be careful of whom is dropped as part of Attrition!
A tip, Trade-in your non essential “players” beforehand, just to make room and gain a benefit for EVO building.
from MLB @ Bat app -> 40-Man Roster.
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TSB19 - SF bay Area