Ward pulled out of Black Sabbath reunion plans last year (12) following a contract dispute and the band's frontman has taken aim at him in occasional rants ever since.
Earlier this year (13), Ozzy suggested Ward lacked the skill required to keep up with the heavy rock and now he's picking on him again.
Prior to a recent New Jersey show, where the three existing members of the group performed with semi-permanent drummer Tommy Clufetos, Osbourne told the New York Daily News he didn't have faith in the original drummer's health.
He said, "I don’t think he could have done the gig, to be honest. He’s incredibly overweight. A drummer has to be in shape. He’s already had two heart attacks. I don’t want to be responsible for his life."
Ward was Sabbath's original drummer but he left the band in 1980 to seek help for a drinking problem. He returned to the group for brief periods throughout the 1980s and 1990s, but was replaced by Faith No More's Mike Bordin when the band reunited in 1997. Ward returned to the group for a tour later that year, and remained a fixture until Black Sabbath split again in 2005.