Top post-draft needs: AFC East

Ras-I Dowling will be called upon to help the Patriots' secondary this season. Steve Mitchell/US Presswire

This is the first part of an eight-part series in which Football Outsiders looks at the biggest post-draft needs for every NFL team. This week will consist of the AFC teams, by division, while next week will focus on the NFC.

Today, Outsiders looks at the AFC East.

Buffalo Bills: Offensive tackle, wide receiver

For the most part, the Bills did a superlative job of improving their team this offseason. The defensive line got the biggest overhaul with the signing of defensive ends Mario Williams and Mark Anderson, but general manager Buddy Nix also retained key offensive contributors like wide receiver Steve Johnson and unheralded-but-effective starting tight end Scott Chandler. The biggest holes heading into the draft were at left tackle and wide receiver, and the Bills addressed both spots on Day 2 of the draft.

There are still concerns, however.