According to Dave Meltzer of The Wrestling Observer Newsletter, former WWE NXT Champion Samoa Joe should be cleared to return to action by the end of October.
Joe has had several surgeries during his time off for nagging injuries. He had knee surgery that he actually needed for quite some time (possibly going back to his time in NXT) but he had been putting it off because he didn't want to miss any ring time until he absolutely had to.
He also had surgery to fix his nose, which has been broken more than half a dozen times. He was reportedly having issues breathing out of it but now the problem has been taken care of.