The original plan for Finn Balor at SummerSlam was for him to face Chris Jericho, according to Dave Meltzer of Wrestling Observer Radio.
Those plans were changed when Vince McMahon decided to go all the way with Balor and have him defeat Seth Rollins for the WWE Universal Championship.
WWE.com recently provided a further update on Balor's injury which has forced him to have surgery:
"Finn’s injury was pretty severe, more severe than normal. A really high energy injury, it did more damage than a standard shoulder dislocation where you simply tear the labrum. The prognosis is excellent, however. We were able to fix it all and put it back where it came from. I’m anticipating him getting back at full speed."