Soccer superstar Vinícius Júnior will be among GOATs when he sweats it out at home from now on ... 'cause he just got an incredible new mural of his favorite athletes inside his gym!!
TMZ Sports has learned -- the 22-year-old Real Madrid winger hit up famous artist René Mäkelä for a truly one-of-a-kind art piece inside his home ... which features realistic images of Michael Jordan, Kobe Bryant and fellow Brazilian footballers Ronaldo and the late Pele.