Sammy Sosa clearly ain't bitter at his broken relationship with the Cubbies ... 'cause the Chicago legend tells TMZ Sports he's still rootin' for the team to make the World Series!!
Sosa's been blackballed from the Cubs organization since he retired -- with owner Tom Ricketts saying Sammy's gotta come clean regarding his alleged PED use before they welcome him back.
But, Sammy clearly ain't offended by all that ... 'cause he tells us he's not only keeping up with the team -- he's hoping they get a chance to win another ring!