According to TMZ, the "Circles" star and fellow rapper Mike Stud, have teamed up to host the Instagram Live event, which will screen on the respective competitors' channels, to raise money for coronavirus relief efforts.
Beginning next week (begins March 30), The Ballina Cup will include 16 teams, with names like Travis Kelce, Rob Gronkowski and model girlfriend Camille Kostek, Johnny Manziel, Machine Gun Kelly, Kane Brown, Major League Baseball (MLB) stars Trevor Bauer and Mike Clevinger, and more slated to join the tournament.
The event will take place over eight days, with two matchups per night in a bid to take home a trophy, wrestling belts, and chains to commemorate the victory.
Post, real name Austin Richard Post, is a renowned fan of the drinking game, with him and Mike previously taking home $50,000 (£40,200) after winning a game.
TMZ reported participants will also contribute to the charitable efforts.
Over the weekend, numerous big-name stars took to social media to keep fans amused amid the lockdown, with John Legend, Ellie Goulding, Rita Ora, Barry Gibb, Diplo, Ryan Tedder, and Joe Jonas all performing from their homes for a 12-hour Twitch Stream Aid fundraising concert on Saturday.
Diplo also delivered a Major Lazer DJ set on the group's YouTube page from 4pm EST, while country couple Vince Gill and Amy Grant hit the stage at an empty Grand Ole Opry in Nashville, Tennessee for a family show as part of the Opry Livestream.