The San Francisco 49ers held their breath toward the end of practice on Sunday when defensive lineman Tarron Jackson collapsed on the field, according to NBC Sports Bay Area. Jackson was taken off the field on a stretcher and transported to the hospital for further evaluation.

The 49ers originally signed Jackson, a fourth-year pro out of Coastal Carolina, to their practice squad in early January. They then signed him to a futures contract after the season. Jackson spent his first three seasons with the Philadelphia Eagles before splitting last year between the Eagles, Carolina Panthers and 49ers.