Conor McGregor made quite the impression in the UFC in a short amount of time.

However, a torn ACL has slowed him down and sent him to the sidelines for the next several months.

McGregor suffered the injury in his win over Max Holloway – his second UFC victory.

“Surgery is done,” he posted on Twitter. “Rehab starts now in the O.C. Feeling great.”

The Irish featherweight called out just about every member of the roster prior to news of his knee injury, igniting flames with the likes of Diego Sanchez in the process.