Houston had a workout scheduled with Thomas, but it did not take place.
The Texans are continuing their search for help at the position but are not planning to make any moves at this time, a source confirmed to ESPN. On Monday, the Texans put safety A.J. Moore on injured reserve after he injured his hamstring against the Pittsburgh Steelers in Week 3.
Houston coach Bill O'Brien told Thomas' agents that the NFL required the Texans to cancel Thomas' workout because of COVID-19 concerns, the agents told ESPN's Adam Schefter.
But a source told ESPN's Dianna Russini reports that the decision to not sign Thomas at this time was not related to COVID-19, but a decision made by the Texans.
"We had a bunch of guys in here ready to work out," O'Brien said. "We said, instead of keeping those guys holed up in a hotel potentially to be there for several days, we didn't know at that point, it was better for us to just cancel the workouts."
Thomas, 31, has been a free agent since he was cut by the Baltimore Ravens in August after Thomas had an on-field altercation with teammate Chuck Clark. The Ravens said they terminated Thomas' contract for personal conduct that adversely affected the team. A source told Schefter that Thomas punched Clark during the practice.
The Texans are 0-3 and are just one of three teams without an interception this season. The Texans also rank 29th in opponent QBR (75.6) and have allowed at least 28 points in all three games.