no. any player who wanted to opt back in to his team's club player pool had to do so by 1 august. i believe that it's possible, however, if that player were released from his contract and became a free agent, that he would be eligible to sign with any other team and be added to their cpp. and from what i've gathered, i'm pretty sure that if the brewers traded cain (players on the restricted list can be assigned to another club via an approved transaction), he could join that new team's cpp. we know that clubs may only trade players in their cpp, but we also know that a player who spent time in his team's cpp but was later removed was allowed to be traded and assigned to his new team's cpp. but, i'm not certain on this possibility. but, i say with certainty that cain cannot return to playing for the brewers in 2020. he is done. he is forfeiting salary and service time with his decision.