Hronek entered the NHL's COVID-19 protocols Thursday.
Hronek hasn't missed a game since Oct. 24. The 24-year-old has averaged 21:11 of ice time -- 1:19 during the power play -- and distributed five assists over the last 10 games. The next game on Detroit's schedule is Saturday against Philadelphia, if Hronek remains out a call-up may be required to pick up the minutes.