Andrelton Simmons decided to opt out of the last five games of the Angels season:

Simmons informed the Angels of his decision Tuesday, the team said in a statement. Neither side has specified a reason for his decision.

ESPN.com

Reading between the line in the article, Simmons will be a free agent. I suspect he doesn’t think it’s worth playing five games for a team out of the playoff picture is worth the risk of an injury. I can understand that, especially if he believes he won’t be playing for the Angels next season.