Mantei is on the 60-day DL and Miller is on the 15-day. I think they may shut Miller down for the year. If they are going to shut him down for the year, then they will put him on the 60-day before September 1. This gives the Sox a chance to replace their playoff eligibility with anyone in the system (as long as they are in the system by August 31).
Now, before anyone goes and pencils them in, there are is something to consider. We are in the middle of a tight pennant race, and the WC race is very tight too. Therefore, none of the games are "throw away" games where you can experiment with young talent. Tito has already shown that he doesn't really like to use rookies that much (see Delcarmen throwing very well in his debut, then not getting the ball again for over a week). If Hansen and Delcarmen are given opportunities, and if they perform well, then the Miller and Mantei injuries would allow them to be eligible for the playoffs.