Colorado's MLS game against Sporting Kansas City has been postponed after a Rapids player and three staff members tested positive for the coronavirus.
Meanwhile, former Toronto FC defender Nick Hagglund, now with FC Cincinnati, said he has also tested positive and is in isolation.
The Rapids suspended training while the unidentified player and staff members who tested positive were isolated. The team has conducted additional testing and contact tracing.
The match between the Rapids and Sporting in Commerce City, Colo., originally scheduled for Sunday, is the first game to be postponed because of positive COVID-19 cases since the teams returned to play in their local markets following the MLS is Back tournament in Florida.
The match has not yet been rescheduled.
Cincinnati's match against New York City FC set for Saturday night at Red Bull Arena was not postponed.
Hagglund said he developed symptoms after a routine COVID-19 test Thursday. On Friday, he was notified his test was positive. A second test was also positive although his wife's results came back negative.
Hagglund said he is isolated from his family, which is monitoring his daughter for symptoms.
"We, as a family, have been vigilant in wearing masks, washing hands and limiting contact with others," Hagglund said in a social media post. "Please let our circumstances be a swift reminder that this virus is real and still present."
The 28-year-old Hagglund, a native of Cincinnati, spent five seasons with Toronto before being traded to his hometown club in January 2019.
It is the first time that a Cincinnati player has been confirmed as positive. The team said all other players and staff members had negative results.
With files from The Canadian Press
Anne M. Peterson, The Associated Press