But Monday afternoon as the team practiced, he was running on the side, a welcome sight after a diagnosis that is not within the normal scope of football injuries. He was in shorts and a long-sleeve T-shirt, wearing the harness they use to collect GPS data, and working a pretty good sweat as he ran something less than full sprints.
Canales said that he wasn't going to play in Thursday's preseason finale, but otherwise the signs were promising.
"Significant improvement, he was actually running today," Canales said. "They were monitoring really closely, checking his oxygen levels, everything.
"Huge improvements. That guy's 20 years old, so he he bounced back pretty quick. The hope is to just continue to just progressing daily and get him more and more work."
After the scare in Houston, that's the best news possible.