Biles left the team after her vault on Tuesday.
Gallegos-Main quickly removed the comments from her social media after they met with backlash.
Sweden won the match 3-0.
Both the men's and women's teams have come off a string of losses in the early warm up games.
Prokops hopes the announcement will help improve his game confidence.
The comments resulted in a rebuke from DeChambeau's equipment manufacturers.
The fight was originally scheduled to take place on 24 July.
Stoney left Manchester United in May.