The San Diego Chargers announced Saturday that wide receiver Eddie Royal, who left practice Saturday in an ambulance, has a bruised lung and a concussion.
Royal fell hard to the ground while trying to make a catch during a drill. He was able to get up and walk to the trainer's area before going back down. He was treated with an oxygen tank with coach Mike McCoy, general manager Tom Telesco and teammates surrounding him.
Royal was then carted off and taken away in an ambulance that arrived on the scene.
McCoy said that Royal was having trouble breathing before he was transported to the hospital.
Royal is in his second year with the Chargers. He had 23 catches for 234 yards with a touchdown last year. He spent the first four years of his career with the Denver Broncos.
It was not immediately known how long he will be out.
The Chargers are also without wide receivers Malcom Floyd and Danario Alexander. Floyd (knee) is expected back by the start of the regular season but Alexander is on injured reserve with an ACL tear. He was placed on waivers.
Also, rookie cornerback Steve Williams is expected to miss the entire season with a torn pectoral muscle he sustained during Thursday's preseason loss to the Chicago Bears.