MLS has cleared clubs to return to full training amid the coronavirus pandemic.
The MLS season was suspended in March due to COVID-19, with a team training moratorium put in place.
But that was lifted on Thursday, although teams must have plans for full team training approved by club medical staff and a local infectious disease expert before submitting them to MLS.
Players and staff will undergo regular testing and anyone testing positive will be isolated, while strict social-distancing and hygiene measures will be in place.
MLS players ratified a new collective bargaining agreement through until the 2025 season on Wednesday.
It is reported the season could resume with a tournament in Orlando starting as early as July.
More than 393,000 people have died from COVID-19 worldwide, with the death toll in the United States exceeding 110,000.