Tight end has sort of become a minor need for the Ravens, after Nick Boyle received another suspension from the league that will cause him to miss the first 10 games of the 2016 season. There are some options in house like Chase Ford, Konrad Reuland, and Harold Spears. There's also Jared Cook, who was released by the Rams a few weeks ago.
But there's an option that is more intriguing than either of them. The Bears are currently working with Martellus Bennett's agent to find a suitable trade partner.
The tight end was a major weapon for the Bears, making the Pro Bowl in back-to-back years in 2013 and 2014. His best years came with Marc Trestman in 2013 and 2014, so he would have some familiarity with the Trestman offense. He's a big-bodied athletic weapon that Joe Flacco could use and he's also a good blocker, which makes him a perfect replacement for Nick Boyle.
The Ravens have two fourth round picks already and they have currently created $10 million in cap space with the ability to make more cap room if they released a few more players.
Bennett has one year left on his contract and a cap hit of $5 million, but the Ravens could lower that cap hit if they reached an extension with the tight end. We haven't heard any news about the Ravens being a possible trade destination for Bennett, but it's a hypothetical situation that's worth thinking about.