it was a trade of players that weren't on 40-man rosters in 2019--that's what allowed for the trade to happen. either club can add the newly acquired player to its 40-man roster at any time. i misread the previous post for eligibility on postseason play, and have since edited it. neither player is eligible for postseason play, but could be used through game 162, or game 163, if necessary. Got it, thank you for the clarification.