The players may have been exposed to the coronavirus at a bar in Clayton, Missouri, where several members of the team congregated over a week ago, according to Thomas. One player reportedly tested positive just days after that gathering.
It is not known whether those who tested positive were experiencing symptoms.
The team reportedly canceled practice on Friday and shuttered its training facility for the weekend due to the test results. The Blues are expected to practice Monday.
Fifteen of the 250 NHL players who reported to team facilities for Phase 2 tested positive for the virus as of Monday. An additional 11 players who did not report for voluntary workouts have also tested positive since June 8, when Phase 2 commenced.
Phase 3 of the NHL's return plan, which signifies the start of training camp, is slated to begin July 10. The NHL and the players' association are reportedly closing in on a new six-year collective bargaining agreement, as well as an agreement on the details of the league's return-to-play plan.