Ice Cube is jacked up for Lamar Odom's dreams of a pro basketball comeback ... but he says there is a catch if the ex-Laker wants to make it in the BIG3 ...
"He's still gotta try out like everybody else."
Yup ... Ice Cube ain't doing the 2-time NBA champ any favors -- telling TMZ Sports, L.O.'s gotta work out just like the rest of the ballers who want in on his 3-on-3 league.
But ... Cube tells us video he saw recently of Odom on the court and in the gym was promising -- and he's hopeful Lamar can make a squad.