Bosa is considered by some experts to be the top overall pick in this draft and is the type of young pass-rusher the Ravens want to pair with Terrell Suggs and Elvis Dumervil, both of whom are in their 30s.
Bosa's high motor and competitive attitude are traits the Ravens often covet in draft picks. Ravens officials recently expressed confidence in Bosa's ability to switch from a 4-3 college defensive end to a 3-4 NFL outside linebacker. He had 26 sacks and 50.5 tackles for loss in 41 career games.
If Bosa is taken in the top five, the Ravens favor taking pass-rushers Shaq Lawson from Clemson or Leonard Floyd from Georgia, the source added. Lawson topped the FBS with 25.5 tackles for loss last season, and Floyd led Georgia with 4.5 sacks and tied for the team lead with 10.5 tackles for loss.
Baltimore has done a great deal of homework on both defenders. Defensive coordinator Dean Pees went to Lawson's pro day, and the Ravens brought in Floyd for a pre-draft visit.
Ravens owner Steve Bisciotti emphasized at the owners meetings that the team needs to add young pass-rushers.
"We have two very dynamic, productive players [Suggs and Dumervil] that are at the age where you don't know if you're going to get one year or three years left in them," Bisciotti told reporters a month ago. "We have to fill those spots with constant pressure. You need five pass rushers in the rotation."