Week 4 of the Fantasy football season is in the books and it's time to decide who to start and who to sit in Week 5. 

But before you finalize your roster for Week 5, you'll want to see what SportsLine Fantasy analyst Brandon Marianne Lee has to say. Lee is a radio host on SiriusXM Fantasy Sports Radio, an on-camera analyst for Fantasy Alarm, and a Fantasy contributor to The Athletic.

Now, she's giving SportsLine members 12 unconventional players to consider for starting lineups in Week 5. One we'll give away: Ravens quarterback Joe Flacco, who has put up surprisingly big numbers this season and gets a strong matchup against the Browns this week. 

"Have you looked at Flacco's numbers? He's been a very good Fantasy quarterback this year, and he's only on around 30 percent of rosters no matter the platform," Lee said. "He's a cheap DFS play -- again, no matter the platform. Twice this season Flacco has thrown for over 300 yards. In both outings, he went over 360 yards. He has the eighth most passing yards in the league, in a year when quarterbacks are playing out of their mind and breaking records left and right."

Lee has also identified an undervalued running back who is set to go off against a defense that struggles defending backs in the passing game. This pick could be the difference between winning your Week 5 matchup or going home with a loss.

So which 12 players absolutely need to be in Fantasy lineups in Week 5? And which undervalued running back needs to be lineups? ... Join SportsLine now to see the list of 12 players to start in Week 5, all from a proven Fantasy expert who can give you a huge edge in your league.