Although not a star, Gibson provided the Rams a certain degree of pass-catching consistency and some big plays. He played in all 16 games last season, started 13 and caught 51 passes for 691 yards and five touchdowns.

The Chiefs were also in the market for another experienced receiver for newly acquired quarterback Alex Smith. They ended up signing Donnie Avery, who grabbed 60 passes for 781 yards with the Indianapolis Colts last season but also had more than his share of drops, most memorable among them the one that killed a late rally in a playoff loss to the Ravens.

Tight ends were also on the move. The Chicago Bears signed Martellus Bennett on the first day of free agency, resulting in the release of Kellen Davis on Wednesday. The Steelers re-signed tight end/fullback David Johnson to a one-year contract. The Browns, meanwhile, were interested in bringing in the Washington Redskins' Fred Davis, according to CBSSports.com, and the Carolina Panthers' Gary Barnidge, according to Pro Football Talk.

The Browns also continued to bulk up their defense, signing outside linebacker Quentin Groves (Arizona) to a two-year deal worth $2.8 million. He was the third front-seven player signed by Cleveland in free agency, joining outside linebacker Paul Kruger and defensive lineman Desmond Bryant.

The Steelers released guard Willie Colon but added some stability to the quarterback position by signing Bruce Gradkowski to back up Ben Roethlisberger.

Fullback Quinn Johnson, lead blocker for star running back Chris Johnson, re-signed with the Tennessee Titans. Last year, Quinn Johnson recorded four carries for 5 yards and five receptions for 40 yards, in addition to contributing on special teams.

The Titans signed free agent Shonn Greene, a starting running back with the Jets the last two years. The contract reportedly is worth $10 million over three years. Greene took over as the starter with the Jets after backing up LaDanian Tomlinson in 2010.

Last season, Greene started 14 of 16 games and rushed for 1,063 yards and eight touchdowns. In Tennessee, he is expected to back up Chris Johnson, in addition to being a third-down and short-yardage back.

The San Diego Chargers announced that wide receiver/return specialist Richard Goodman, an exclusive-rights free agent, signed his one-year contract tender. Goodman is entering his fourth season with the Chargers.

San Diego also bolstered its offensive line by signing three free agents, tight end John Phillips (formerly of the Dallas Cowboys), tackle King Dunlap (Philadelphia Eagles) and guard Chad Rinehart (Buffalo Bills).

In addition to acquiring Welker, the Broncos agreed to terms with unrestricted free agent defensive tackle Terrance Knighton and with linebacker Stewart Bradley, who was released by the Cardinals on March 1.