AP file photo by Charles Rex Arbogast / Major League Soccer commissioner Don Garber

FC Dallas has withdrawn from the MLS is Back tournament in Florida after 10 players tested positive for coronavirus.

Major League Soccer said Monday that of the 557 players sequestered at a pair of hotels at the Walt Disney World Resort near Orlando, Florida, 13 have tested positive: 10 for Dallas, two from Nashville SC and one from the Columbus Crew. An FC Dallas coach also tested positive.

"The decision to have them not participate in the tournament is in the best interests of everyone, of the Dallas players and the other 25 teams, and allows us to continue to manage the health and safety of our players while continuing to go forward with our plan," MLS commissioner Don Garber told The Associated Press in a telephone interview Monday.

Apart from the health and safety aspect, the number of positive cases also meant that Dallas could not play competitive games.

"As we continue to focus on the well-being of our players, coaches and staff who are in isolation in Orlando, we understand it is not in their best interests to compete at this time," coach Luchi Gonzalez said in a prepared statement. "While we're disappointed, the health and safety of our traveling delegation as well as our league partners is our highest priority."

Dallas announced last week that six players had tested positive upon arrival in Florida for the tournament, and the entire team was quarantined. As a result, the team's opening match on Thursday against the Vancouver Whitecaps was postponed.

With the withdrawal, MLS was devising a new schedule for the monthlong tournament, which will be played without fans at ESPN's Wide World of Sports Complex at Disney World.

The tournament is still set to open Wednesday with two matches, both of which will be televised by ESPN: Orlando City versus club Inter Miami CF at 8 p.m. and Nashville SC versus the Chicago Fire at 10:30. Miami and Nashville are first-year expansion clubs in the 25th anniversary season for MLS.

Also on Monday, Los Angeles Football Club forward Carlos Vela opted out of the tournament due to concerns for his wife, who is pregnant with their second child.

"I always want to give everything I have to my club, our fans and supporters and the city of L.A.," Vela said in a released statement. "However, it is in the best interest of the health of my family to stay home and be with my wife during what is a risky pregnancy."

MLS shut down because of the coronavirus pandemic on March 12 after its 26 teams had each played two games. Garber vowed to stop the tournament, which MLS plans to follow with regular-season matches in teams' home cities, if warranted.

"If there is a situation at any time that I believe that the protocols aren't working, and the health and safety of our players is at risk, then I will make the decision to shut down the tournament," Garber said. "That is something I committed to the players and to our entire league early on. But this is proving that our protocols worked and our plan so far has been sound."

FC Dallas previously revealed that all players and staff tested negative for the coronavirus before leaving for the tournament June 27. Upon arrival, two players tested positive. Subsequent tests found four more players infected with the virus that causes COVID-19.

"We absolutely agree with the league's decision to withdraw FC Dallas from the MLS is Back Tournament out of safety concerns for our players and staff," FC Dallas team president Dan Hunt said. "We're looking forward to resuming the 2020 season once the entire club is healthy and in position to play competitive matches at the highest level."

The league said no other team was in contact with the Dallas delegation. League protocol requires players and staff to be tested every two days upon arrival in Florida.