Jim Harbaugh's Chargers are one of two road favourites, with six away wins this season, thanks to quarterback Justin Herbert having the most efficient year of his career and the meanest defence in the NFL allowing just 17.7 points a game.

They were the second top scorers and behind Allen's brilliance they avoided the mistakes that dogged them in recent years - in fact, they are the only team in Super Bowl times to allow an average of fewer than one sack and one turnover a game.

Both sides averaged over 28 points a game, which is rare for a wildcard meeting, both have home run hitters at receiver and neither quarterback knows when he is beaten.

"I just don't think the players, the manager or the fans believe they can go on and win a game like this," former Rangers striker Rory Loy said on Sportsound.

During the first 12 with the Detroit Lions, Stafford got three opportunities to participate in the playoffs and did not win a game.