Didier Drogba lost what might be the last game of his career, while Phoenix Rising was beaten 1-0 by Louisville City FC in the final of the United Football League Cup.
Former Chelsea striker for 40 years said it was his last season.
In April 2017, Drogba became co-owner of Phoenix Rising in the second division of the US.
Owner Berke Bakay thanked for "incredible contributions to this beautiful sport" after the defeat on Friday.
Drogba scored a goal in each of the three play-offs of the club on his way to his first USL Cup final.
"You have laid the foundation for something really special that we will all enjoy many years ago," Bakay wrote on Twitter.
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Before the final, Bakay told the BBC that Drogba will remain in the club after retirement.
At Phoenix Rising last month, Drogba said he was not kidding when he asked his opponents to give him the cup so he could retire at peace.
He had promised to put his cellars back in his hands if he did not have the coveted trophy, but he clarified near the end of his message that this is his last season.
The club did not confirm its withdrawal. Drogba scored 157 goals in 341 caps during his first stage in Chelsea from 2004 to 2012, winning three Premier League titles and the Champions League.
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After Shanghai Shanghai in China and Galatasaray in Turkey, where he won the Super League and the Turkish Cup, Drogba returned to Blues for the 2014-15 season, marking seven goals in 40 matches and helping José Mourinho's men to win the title.
He then spent 18 months at Montreal Impact before joining Phoenix.
He scored 65 goals in 104 matches for Côte d'Ivoire and was twice named African footballer of the year.