It seems funny to list Ben Roethlisberger as a sleeper, but his current fantasy value seems extremely low. Yes, he is coming off a serious injury, but that doesn’t mean he will completely regress. He is surrounded by talent, and his red-zone production should spike with some of the new targets.
All that said, he is currently the 19th ranked QB, behind the likes of Ryan Tannehill, Jared Goff, and Joe Burrow. Based on his talent and progress through recovery so far, he should be able to jump those three players easily. A safe stat line for Roethlisberger seems like 4500 yards, 28-30 TDs, and 10-12 INTs. Not elite numbers by any means, but it would give him around 285 points. That would have put him at the number 9 spot last year.
This isn’t to say Roethlisberger will be a top fantasy option, but it isn’t unthinkable that he could rebound and be a low-end starter. Look to draft Roethlisberger late as your backup, and if he can shake that rust off early, you could have a quality starter by midseason.