American tested positive and withdrew from the Detroit tournament.
Like Campbell, English did not play last week in Connecticut.
South African Dylan Frittelli is also in self-isolation after testing positive for the coronavirus, before he was to have flown Sunday on a PGA player charger to Detroit from the Travelers Championship.
Nick Watney was the first PGA Tour player to test positive since the restart at the Heritage tournament two weeks ago. Fellow Americans Cameron Champ and Denny McCarthy tested positive last week at Connecticut, where two caddies also tested positive.
The PGA Tour also announced on Wednesday that three players on the developmental Korn Ferry Tour tested positive prior to this week's TPC Colorado Championship.