The announcers at WWE Smackville informed the fans at home that Finn Balor was not cleared to compete against Shinsuke Nakamura.
The reason why he was not cleared is that he’s dealing with an illness and it’s not something that is expected to keep him out for more than a couple of days.
As of this writing, Balor is scheduled to face Dolph Ziggler on SmackDown Live and a WWE source tells me that Balor is expected to be fine by Tuesday so the match is still on. Basically, there is no injury and he should be fine within a couple of days.
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