Probably means they can only be on a rehab assignment so long before being activated or just shut down again for a period of time. Doesn’t sound like either are ready to come back
At this point, it wouldn’t be like he’s a headlining player in a trade, but if he got a shot to play everyday at SS for two months, he might be a guy we can flip in the offseason and give Montgomery a little more time in the minors.