Simmons, a former Mississippi State star, has 12 tackles, three quarterback hits and a sack for the 3-0 Titans, who picked the lineman 19th overall in the 2019 NFL draft.
The Titans have suffered a COVID-19 outbreak within their organization, with eight players and eight staff members testing positive, per Adam Schefter of ESPN. The identities of those players and staff have not been disclosed.
The first three weeks of the NFL schedule were played without issue amid the COVID-19 pandemic, with thousands of tests coming back negative.
However, that hasn't been the case in Week 4. The New England Patriots' road game against the Kansas City Chiefs, which was scheduled for Sunday, has been postponed to Monday or Tuesday after players from both teams tested positive for COVID-19.
Per Schefter, Tuesday appears more likely.