Christian suffered a concussion during his match with Randy Orton on last week's episode of WWE Monday Night Raw. He's been pulled from all upcoming dates as a result of the injury.
Dot com updated his status at this link where they included quotes from WWE physician Dr. Chris Amann. Below is an excerpt:
"We've pulled him out of all activity," said Amann. "His ImPACT scores are normal, but he’s still having some symptoms of fogginess and cloudiness."
He continued, "We are waiting for symptoms to get better until we perform an in-ring exertional challenge later this week at the Performance Center in Orlando. At that point, if he’s able to get in the ring and exert himself, and work without symptoms, we'll go ahead and clear him [to compete]."