At the beginning of the week, the Colts said that about 5,000 tickets were unsold and were available for fans to snatch up.

By Wednesday afternoon, the team said a few hundred tickets were still available, hours before an 8 p.m. deadline.

If all the tickets aren't sold out by Wednesday evening, the NFL could keep the game from being shown in Indianapolis.

A large banner at the top of the Colts' website Wednesday afternoon implored fans "don't miss history" and said that tickets were selling fast.

Several players, including punter Pat McAfee, wide receiver Pierre Garcon and cornerback Jacob Lacey took to Twitter and other social media, giving away tickets to followers and promising another ticket giveaway on Friday.

Blackouts haven't been an issue in recent years for the Colts, who have enjoyed unprecedented success as one of the league's top teams each year.

Tickets listed as still available through Ticketmaster range in price from $71 to $337 a seat.