Logan Paul announced on his social media accounts that he has a torn meniscus, MCL, and a potential ACL tear. Paul says that it happened about halfway through the match.
When you consider how much he did during the second half of that match, it's pretty incredible that he was able to continue at such a high level.
The injury likely means that he would be gone for several months. It's unknown when he was going to be used again on WWE TV but he has a multi-year deal and the next logical time to use him would have been at the Royal Rumble. That seems unlikely right now but he could potentially be back in time for WrestleMania, depending on the severity of the injury.
Best wishes to Logan Paul for a speedy recovery.