The NBA is still tinkering with the details of its impending resumption of the 2019-20 season. A wave of players have recently expressed concern about participating in the Walt Disney World bubble that will take place starting July 31.

Those deciding against participating in Orlando could be replaced by a substitution player, according to ESPN’s Adrian Wojnarowski. The league also plans to allow replacements for players who test positive for COVID-19 or suffer injuries throughout the restart. Those replaced players will then become ineligible for the rest of the 2019-2020 season.

Last week’s agreement to resume the season came with the notion that players could choose to opt-out if they felt unsafe to take part in the bubble. In order to not give teams a sense of disadvantage, they will be allowed to substitute the now-inactive players with substitutes, either via converting from a two-way spot or signed via free agency.

Some cap leniency is to be expected here, though the specifics of how that would come about is not yet fully clear. The NBA has a lot of rough edges to polish during the next six weeks before the season resumes, having laid out the plan’s exoskeleton to come to an agreement between players and owners.

There were reportedly 40 to 50 players discussing concerns about the restart of the season, yet there has been no formal petition sent to the NBPA from any group wanting out of the 22-team resumption.

The NBA has put plenty of restrictions in place to ensure the health of the players, staff, and their families, but there’s still a certain amount of uncertainty that comes with a worldwide pandemic.