A total of 392 people including players, coaches and staff members have been tested since the teams began arriving in Florida, and the FC Dallas players are the only people who have tested positive for Covid-19, MLS said.

"While in isolation, the individuals are in daily communication with and receive remote care from a healthcare provider, including monitoring of symptoms and regular follow-up testing," the league said.

The rest of the FC Dallas delegation are currently "quarantining in their hotel rooms pending the results" of additional Covid-19 tests.

The team has not been in contact with other teams since they arrived in Florida, MLS said.

The team said in a statement that the players, coaches and staff tested negative for the virus before they traveled to Florida.

It's unclear how the diagnoses will impact the team's future in the tournament.

FC Dallas has its first match scheduled for July 9 against Vancouver.

Several MLS players from multiple teams have tested positive since March.