Zylstra (knee) is active for Sunday's Week 15 contest against the Rams.
Zylstra was hurt in Week 2 against Chicago and subsequently landed on IR. He was activated Saturday and is now officially ready to return to action. With Sam LaPorta (back) and Brock Wright (neck) both on injured reserve, there is room for Zylstra to carve out a tangible role in the Lions' tight-end corps.