Potential replacements for Jeremy Maclin
Avant has 259 catches for 3,199 yards and 10 TDs in seven seasons with the Eagles.
Cooper had 13 catches for 240 yards and a touchdown in three starts last season.
Johnson, the all-time NCAA total yardage record holder, caught 19 passes for 256 yards as a rookie last year.
Benn, a former second-round pick, is currently sitting out practice with a knee injury that's not considered serious.
Momah (6-7, 239) hauled in 39 passes for 629 yards and six TDs over four seasons at Boston College.
Shepard signed with the Eagles because he wanted to play for Chip Kelly, who aggressively recruited him to play at Oregon.
The Eagles claimed Salas, a former Ram and Patriot, off of waivers on Nov. 23, 2012.
Cunningham concluded his career at Michigan State as the school's all-time leader in receptions (218) and receiving yards (3,086). He was cut by the Dolphins last summer.
Murphy had 19 catches for 181 yards and a TD as a senior under Chip Kelly at Oregon.
Ball, seen here with the Jets in 2008, played under Chip Kelly while Kelly was the offensive coordinator at the University of New Hampshire. He signed with the Eagles on Saturday.