The San Diego Chargers -- more than any team in the AFC West -- can't afford another injury at wide receiver.

Michael Gehlken of U-T San Diego reported that pass-catcher Eddie Royal left Saturday's practice in an ambulance after falling hard to the ground while attempting a catch during an 11-on-11 drill.

"He was about 10 feet in the air" safety Eric Weddle told Tom Krasovic of U-T San Diego. "He just fell straight down on his back."

Royal initially got to his feet and made his way to the trainer's room before stopping and going to the ground. Trainers treated Royal with an oxygen tank as coach Mike McCoy general manager Tom Telesco and teammates gathered around. After an ambulance and two fire trucks arrived Royal was loaded onto a gurney and was carted away before practice resumed.

McCoy told reporters that Royal was having trouble breathing and will be hospitalized for examination. Royal's teammates hoped for the best.

"When a guy gets carried off in an ambulance you just want him to be healthy be OK all football aside" Philip Rivers said. "And hopefully that's the report we'll get back soon on Eddie."