Polenta's message, in Spanish and English, warmly thanks the Galaxy and fanbase for his tenure with the club.
"I want to thank all members of the LA Galaxy for the trust, the affection and the way they treated me," Polenta's English-language message reads. "It was an amazing experience. I [especially] want to thank Guillermo [Barros Schelotto] and his coaching staff for believing in me and Dennis [te Kloese] for always wanting the best for both parts. I know I will always be welcome back to the team, which is something that I really appreciate. To my teammates, staff and fans, a big thank you! Good luck and success for the upcoming [future]!"
Polenta, 27, joined ahead of the 2019 season, the Uruguayan having stepped away from the sport before being persuaded to return and play for the Galaxy. He made 28 appearances, all starts, in MLS regular season play, and started both of the Galaxy's Audi 2019 MLS Cup Playoffs games.
According to Corner of the Galaxy, Polenta wanted to leave LA in order to be closer to his family.
Polenta's contract option was formally declined by the Galaxy, among the end-of-season moves announced by the club on Thursday.