Zylstra (knee) has been ruled out for Thursday's game versus the Cowboys.
Zylstra has been on injured reserve since getting hurt in Week 2 against the Bears, and he finally returned to practice Monday. The 29-year-old tight end isn't quite ready to return to action, however, and he'll aim to get back in the mix in Week 15 versus the Rams. Last season, Zylstra averaged just 9.0 offensive snaps per game.