The USL campaign begins in March 2018 and finishes in November.
Drogba, who turns 40 in March, told RMC Sport: "Ah, do you want a scoop? I think next year will be my last season.
"At some point you have to stop. I need to have time for my other projects."
Drogba became the first player-owner at an American club when he bought a stake in Phoenix this year.
He added: "I need time for my other projects. It's good to play, but at 39, it holds me back a bit."