Eagles pick up safety

The Eagles picked up safety Brett Johnson off waivers from Buffalo, the team announced Monday. Signed as an undrafted rookie free agent by the Bills following the 2010 draft, Johnson played college football at California.

The 6-foot-1, 194-pound rookie played free safety with the Bears. He recorded just three interceptions in 49 career games. Johnson comes with the tag of being an exceptional athlete but an underperformer on the field.

The Eagles were down a safety by the end of spring practice after Marlin Jackson ruptured his Achilles tendon. He is done for the year. The team was also without rookie Kurt Coleman, who could not participate in practices as he finished up his college requirements. Coleman is expected to be at training camp.

Rookie Nate Allen will enter camp as the starter at free safety.