Johnny Manziel's not even talking about his NFL future anymore -- and instead he's moved on to more heady topics ... about his pal Justin Beiber.
Yes, Johnny Football happily talked hair Monday afternoon in Bev Hills -- 'cause like everyone else on the planet ... he's got an opinion about Justin's new dreadlocks. Remember, Johnny and the Biebs kicked it at 1 OAK over the weekend.
Check it out ... this video proves it Manziel's in full Hollywood mode. He's in even walking out of the Saint Lauren store on Rodeo Drive.