The Orlando Pride have withdrawn from the upcoming National Women’s Soccer League tournament after six players and four staff members tested positive for COVID-19.

The NWSL is the first professional team sport scheduled to return amid the coronavirus pandemic. The monthlong Challenge Cup tournament is set to start Saturday in Herriman.

Another round of testing will take place to confirm the results, the league said in announcing the positive tests Monday. Because of the number of positive results and the short time before the start of the tournament, the Pride withdrew.

The names of the players and staffers who tested positive were not released.

Among those on the Pride’s roster are U.S. national team players Ali Krieger, Ashlyn Harris, and Emily Sonnett, as well as Brazilian star Marta.

The players who tested positive were asymptomatic. They will be isolated for 14 days and those they’ve come in contact with will be monitored.

Orlando was supposed to play its first match Saturday night against the Chicago Red Stars.

“The health and safety of our players and staff is our number one priority and our thoughts are with those players and staff fighting this infection, as well as the entire club in Orlando that have been impacted as a result,” NWSL Commissioner Lisa Baird said in a statement. “We’re all obviously disappointed, but in the current environment, this is a situation that we have prepared for and we will now adjust our plans and schedules to reflect the circumstances.”

The league released a revised tournament schedule on Monday.

The NWSL had been scheduled to release the rosters for the participating teams Monday. Players are allowed to opt out of the tournament if they have health concerns, while still receiving their salaries for the season and insurance.

“This was obviously a difficult and disappointing outcome for our players, our staff and fans. However, this is a decision that was made in order to protect the health of all involved in the Challenge Cup,” said Amanda Duffy, the Orlando Pride’s executive vice president. “While we were all excited to see the 2020 Pride on the field this weekend, our priority is now making sure our players and staff safely recover, and providing any support wherever and however possible.”

The Pride’s players did not have contact with the club’s affiliated Major League Soccer team, Orlando City SC. The Pride’s training facilities are closed for cleaning and sterilization, the club said.

NWSL Challenge Cup schedule
All games at Zions Bank Stadium in Herriman, except semifinals and finals, which are at Rio Tinto Stadium in Sandy
Saturday, June 27
North Carolina Courage vs. Portland Thorns, 10:30 a.m. (CBS)
Chicago Red Stars vs. Orlando Pride, 8 p.m.
Tuesday, June 30
Washington Spirit vs. Utah Royals, 10:30 a.m.
OL Reign vs. Sky Blue, 8 p.m.
Wednesday, July 1
Portland Thorns vs. Orlando Pride, 10:30 a.m.
North Carolina Courage vs. Houston Dash, 8 p.m.
Saturday, July 4
Washington Spirit vs. OL Reign, 10:30 a.m.
Chicago Red Stars vs. Utah Royals, 8 p.m.
Sunday, July 5
Houston Dash vs. Sky Blue, 10:30 a.m.
North Carolina Courage vs. Orlando Pride, 8 p.m.
Wednesday, July 8
Utah Royals vs. OL Reign, 10:30 a.m.
Washington Spirit vs. Portland Thorns, 8 p.m.
Thursday, July 9
Chicago Red Stars vs. Houston Dash, 10:30 a.m.
Orlando Pride vs. Sky Blue, 8 p.m.
Sunday, July 12
Utah Royals vs. North Carolina Courage, 10:30 a.m.
Portland Thorns vs. OL Reign, 8 p.m.
Monday, July 13
Chicago Red Stars vs. Sky Blue, 10:30 a.m.
Washington Spirit vs. Houston Dash, 8 p.m.
Quarterfinals
Friday, July 17
TBD vs. TBD, 10:30 a.m.
TBD vs. TBD, 8 p.m.
Saturday, July 18
TBD vs. TBD, 10:30 a.m.
TBD vs. TBD, 8 p.m.
Semifinals
Wednesday, July 22
TBD vs. TBD, 10:30 a.m.
TBD vs. TBD, 8 p.m.
Championship
Sunday, July 26
TBD vs. TBD, 10:30 a.m. (CBS)