A berth in the NFC championship game will be on the line when the San Francisco 49ers host the Minnesota Vikings on Saturday in a NFL divisional round game at Levi's Stadium. Kickoff is set for 4:35 p.m. ET. San Francisco is a seven-point favorite while the Over-Under for total points scored is 44.5.

Before you make any 49ers vs. Vikings picks or NFL playoff predictions, you NEED to see what SportsLine's resident 49ers expert, Tom Fornelli, has to say.

The CBS national writer has gone a wallet-fattening 31-21 this season with his NFL best bets. In addition, he has demonstrated a particularly sharp eye for the tendencies of the 49ers. In fact, he is 10-1 all-time on his against the spread picks involving San Francisco! Anyone who has followed him is WAY UP.

Now he's studied 49ers vs. Vikings from every possible angle. We can tell you he's leaning Under, and he's also found a critical X-factor that has him jumping all over one side of the spread! You ABSOLUTELY need to see it before you lock in your own picks.

So who wins 49ers vs. Vikings? And what critical X-factor makes one side of the spread a MUST-BACK? ... Join SportsLine right now to see which side of the 49ers vs. Vikings spread you should be all over on Saturday, all from the expert who's an INSANE 10-1 on picks involving San Francisco!