As the rest of Rapoport's tweet went on say, there are some things to work out first. Johnson is also the first pick of the San Diego Fleet of the Alliance of American Football, so he will at least temporarily need to get out of that to back up Sanchez.
BAL QB Ryan Mallett - 2017 Fantasy Football Outlook
Joe Flacco is nursing a back injury that has a chance of lingering into the regular season, so it’s possible Ryan Mallett could see some action during the first couple of games. Mallett has a rocket for an arm and has shown flashes of ability in limited opportunities throughout his career.
Mallett’s accuracy has always been an issue, and at age 29, it’s unlikely he’ll ever take the next step to becoming a regular starter. Even if he does start a couple of games, there’s no risk of him taking over the job from the veteran Flacco, and the Ravens don’t provide prolific fantasy QB numbers anyway.
2017 Bottom Line
There’s no reason to draft Mallett. Flacco is a borderline QB2 option in most leagues, so investing in his backup makes very little sense. If Flacco’s back injury gets worse, then Mallett could develop into a potential streaming option, but that’s his ceiling.