If DirecTV streaming will work in PR, then he could subscribe to the NFL package, or the Sports Pack which had NFL Network, RedZOne, NBA TV, MLB etc.

You'd have to have a US based location and account to sign up for DTV then stream it using your phone, cast it to apple TV mirror or to the TV might need a VPN where you could set your location to the USA.

Neighbor did that when his son was in Europe playing basketball, used a vpn and streaming so he could get the NBA games.