If the answer is No to any two questions above then How will the winning side be decided?
Appendix 7.5 of the IPL playing conditions states,
Should any player (including the batsmen and bowler) be unable to continue to participate in the Super Over due to injury, illness or other wholly acceptable reasons, the relevant Laws and Playing Conditions as they apply in the main match shall also apply in the Super Over.
As per the normal playing conditions, the bowling captain can replace an injured bowler with another bowler of his choice. This would apply to the super-over as well and a new bowler will bowl the remaining balls of the over.
In the super over, if one of the openers gets injured, then the third nominated batsman comes out to the middle.However, if one of the openers is already dismissed and if another batsman gets injured – it gets interesting.
According to the rules in the main match, if a team is 9 down and a batsman gets injured, the batting team will have to bring their innings to a closure as everyone else has been dismissed. Strange as it may sound, if the same rules apply to the super-over, if a nominated batsman has been dismissed and another injured, then the team forfeits the remaining balls in the over and they end up with the then prevalent score.
Another source: Appendix 7.6 of ICC’s T20I Playing Conditions.