Jose Canseco: I'm Fighting Michael Lohan ... For Real.

Wanna see Jose Canseco beat up Lindsey Lohan's dad?

Well, your wish may finally come true ... because the Bash Brother is signed on to fight Michael Lohan in a celebrity boxing match ... TMZ Sports has learned.

It's being hailed as the "Battle of the Hollywood Bad Boys" -- and celeb fight promoter Damon Feldman tells us it's all going down in September at a venue in Los Angeles.

Feldman says the fight won't be a cakewalk for Canseco ... Lohan is 3-0 in celeb boxing fights, beating up guys like reality star Jonny Fairplay.

Canseco is 5-1 in the celeb boxing world ... with victories over Danny Bonaduce and 'Real Housewives' alum Tareq Salahi.