Philadelphia Eagles cornerback Nnamdi Asomugha was evaluated for a concussion after colliding with teammate Nate Allen during a training-camp session Monday.

Asomugha, signed as a free agent last year after spending his first eight seasons with Oakland, was also left with a lacerated lip and sore neck as a result of the mid-air collision, which occurred on a pass play during a seven-on-seven period.

Quarterback Michael Vick attempted to hit wide receiver DeSean Jackson near the left sideline, but Asomugha and Allen, a third-year safety, converged as onlooking fans gasped.

"Just one of those plays," Allen said. "It happens sometimes. His helmet went into my chest and my forearm caught him a little bit. It happened so fast, it's hard to tell what hit what."

The Eagles will meet New England next Monday.

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