LeBron James and Kyrie Irving won a ring together before, and it may not have been their last ... 'cause Matt Barnes tells TMZ Sports the Lakers could be smelling champagne if Kyrie Irving joins L.A.
Matt -- who played for the Purple and Gold for two seasons -- spoke about the recent Irving rumors out at LAX this week ... and he told us if Uncle Drew ends up with the Lakers, it could result in the franchise's 18th championship.
Barnes thinks Irving -- who is rumored to be at a standstill in contract negotiations with the Nets -- would be the perfect fit for the Lake Show .