LeBron James, Darnell Jackson and Coby Karl of the Cleveland Cavaliers have all tested positive for Influenza A of which H1N1, or Swine Flu, is a strain.
The three players are being treated as if they have the H1N1 virus.
Two other players, Andre Barrett and J.J. Hickson, have had symptoms but have not been tested.
James spent two days recovering at home and will travel with the team on their weekend road trip to Texas.
There is no word on the health of their families.