SAN FRANCISCO (CBS SF) — The San Francisco 49ers were warning their fans to be wary of fake tickets circulating for Saturday’s NFC Divisional Playoff matchup with the Green Bay Packers at Candlestick Park.

The playoff game was sold out and fans were reminded that the only way to guarantee authenticity of the tickets is to purchase tickets through reputable vendors such as the NFL Ticket Exchange, the only ticket re-sale site officially supported by the San Francisco 49ers and the NFL.

READ MORE: KPIX Reporters Remember Slain Security Guard Kevin Nishita; 'Just the Kindest Man'

Fans were urged to beware purchasing tickets from anyone selling them on the street or in front of the venue.

READ MORE: UPDATE: News Crew Security Guard Shot in Oakland Dies From Injuries; Photo of Suspect Vehicle Released

Likewise, fans were warned to be cautious when purchasing tickets online from unsecured Internet vendors.

Additionally, fans were advised to avoid using cash. Before purchasing a ticket, verify the seats on a seating chart.

MORE NEWS: Teenage Programmer in East Bay Creates Internet Study-Buddy Platform for Students

(Copyright 2013 by CBS San Francisco and Bay City News Service. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)