Today is the deadline for adding players to the 40 man roster for the purpose of protecting them from the Rule 5 draft.
My guess would be that Jose Vallejo and John Mayberry, Jr., are the only guys added. If there's a third, I'd guess it would be Omar Poveda, but he seems like a longshot for someone to want to carry in the pen all season.
I seem to be in the minority on this, but I just don't see why Pedro Strop would be added, since the Rangers could have just given him a major league deal in the first place, or claimed him on waivers in September, if they were willing to use a 40 man roster spot on him.