By virtue of their head-to-head record, the Cubs would host the game at Wrigley Field at noon Monday.
Tickets for the extra tiebreaker game will go on sale 7:30 p.m. Sunday at www.cubs.com/singlegametickets.
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The Cubs will offer an in-person purchase opportunity beginning at 8 a.m. Monday at the Wrigley Field Ticket Office located on Clark Street, just north of the Marquee. Fans also can purchase tickets for the game by telephone beginning at 8:30 a.m. Monday by calling 800-THE-CUBS (800-843-2827). Tickets are available on a first-come, first-served basis.
The winner would capture the NL Central Division title.
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The loser would have to play in a single-game wild card playoff game on Tuesday.
On Sunday, the Cubs beat the St. Louis Cardinals, 10-5, while the Milwaukee Brewers bested the Detroit Tigers, 11-0.
The NL Central winner moves on to a Division Series against the winner of Tuesday's wild card game - between the second-place teams in the West and Central.