https://cdnph.upi.com/ph/st/th/2951783964937/2026/upi/2fd2cd1ac0ac5b7f0b5473eee3f0eccf/v1.5/Conor-McGregor-to-undergo-surgery-vows-to-return-to-UFC.jpg" /> Conor McGregor will undergo surgery for the leg injury he sustained at UFC 329 and plans to return to the octagon, he announced Monday on Instagram.