Ryan, a redshirt freshman walk-on, was injured while making a diving catch, the school said.
Before enrolling at Clemson, Ryan played football at Summit High School in Summit, N.J.
The elder Ryan has attended multiple Clemson games, including one that coincided with the final roster cuts of the 2013 preseason.
The Jets drafted former Clemson quarterback Taj Boyd in the sixth round of April's draft.
More from the AP:
Clemson coach Dabo Swinney said Ryan was playing well, but will be out for a while with the injury. Swinney said he expected the 5-foot-11, 160-pound Ryan to be a good player for the Tigers down the road.
- Dan Gartland