3 things that could happen if injured Seth Rollins is forced to miss Hell in a Cell

#2 Rollins is replaced

Kurt Angle or Triple H to replace Rollins again Ziggler and McIntyre

The Shield have a few ex-members running around that could help out in their time of need like Kurt Angle, and Triple H. Perhaps one of them can replace Seth Rollins in the possible tag team match between the Shield and Dolph Ziggler and Drew McIntyre for Hell in a Cell.

Alternatively someone new could step in for Rollins, such as Finn Balor, who the Shield saved by returning, or even Jason Jordan who might be fit to return to the ring by Hell in a Cell and has history of successfully tag-teaming with a Shield member.