Donald Butler re-signs with Chargers

Middle linebacker Donald Butler, considered by many to be the San Diego Chargers' top offseason priority, has agreed to a multiyear contract, the team confirmed Friday.

Butler expressed his happiness with the deal on Twitter.

At 25, Butler is one of San Diego's core players on defense. However, he has had trouble staying healthy, missing 24 of a possible 64 games in his four-year career. He missed three games last season with a groin issue yet was second on the team in tackles with 84.

The University of Washington product was selected in the third round of the 2010 draft, and he missed his entire rookie season because of an Achilles tendon tear in training camp.

With Butler secured, the team can focus on retaining other players set to hit the market before the beginning of free agency on March 11, including guard Chad Rinehart and center Rich Ohrnberger.