First things first ... Latavius Murray says he's NOT replacing Adrian Peterson in Minnesota. You can't replace a legend. That said, LM says if you get the chance to draft him in your fantasy league ... DO IT!!!! The Vikings running back tells TMZ Sports he's fired up to get on the field with his…

Latavius Murray -- who just signed with the Vikings -- says he will NOT continue to wear #28 on his new team ... because he doesn't want to disrespect Adrian Peterson. The former Oakland Raiders running back has been rocking #28 on previous teams for years ... saying he was initially inspired by…