Bama can't afford a loss

Both Oklahoma and Alabama may need to go undefeated to reach the College Football Playoff. Icon SMI, USA TODAY Sports

During the BCS and other previous eras of college football, a major complaint about the preseason polls was that they created a pecking order among teams that made it very difficult for any one outside of the top 10 to survive a loss and still win a national title.

Last year's Auburn Tigers, however, didn't appear on a single preseason ballot, suffered their only loss in September and still played Florida State in the BCS Championship Game. And now that the College Football Playoff will give four teams a shot at a national title -- and since the selection committee won't even begin to discuss the teams until late October -- there's little reason to believe that preconceived notions in August should have anything more than a minuscule effect on the postseason picture moving forward.

But while preseason rankings now have less impact on a team's postseason outlook, some teams will still have a tougher time overcoming a loss than others.

Of the top 15 teams in the ESPN Power Rankings, these four will likely suffer the most.