The 'Evil Woman' hitmakers will headline the Barclaycard presents British Summer Time Festival on July 4, joining the likes of Soundgarden, Faith No More and Motörhead on the bill, and the musician thinks it could be the last time fans get to see them live on stage.
Speaking to Metal Hammer about the gig, Tony said: ''It could be the last ever Sabbath show. I don't want it to be, but there's nothing really planned touring-wise after that show, so for all we know that could be it really. To be honest I don't want to be touring to this extent too much longer, because it makes me feel so bad.''
The 66-year-old musician was diagnosed with lymphoma in January 2012 and is awaiting a check by doctors after undergoing treatment in March.
He said ''I'm at a stage now where I have no support, which means I have to see whether the cancer is coming back or if it's still there or what.
''I just don't know. It's a bit of a worry. After we finish this tour I'll go in and have scan, so we'll see what that shows up.''
Black Sabbath, also made up of Geezer Butler and
Ozzy Osbourne, are touring in support of their latest album, '13', which hit the number one spot on the Official UK Album Chart to become their first hit record in nearly 43 years.
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Brody Dalle's band dropped their first new music since 2003's 'Coral Fang'.
Sometimes actors are not acting.