![Conor McGregor Victory](https://mmainsight.com/wp-content/uploads/2016/08/Conor-McGregor-Victory-696x403.jpg)
The UFC 257 Countdown video is out now and features a closer look at the two biggest fights on the card as Conor McGregor returns to action in a rematch with Dustin Poirier, while former Bellator champion Michael Chandler makes his UFC debut against Dan Hooker.