Jacas (knee) was a limited participant in Saturday's practice, Mike Reiss of ESPN.com reports.
Jacas was seen working with coach Mike Vrabel 1-on-1 on punt-protection techniques. The rookie second-rounder out of Illinois still resides on the active/non-football injury list due to a knee issue he underwent surgery after being drafted to fix. Limited work in training camp means there is a good chance Jacas is ready for the regular season and can contribute to the Patriots' defense as a rotational outside linebacker.