Sir Roger Daltrey is gripped by fear that his failing health could bring an abrupt end to what is expected to be The Who's final tour, RadarOnline.com can reveal.

The 81-year-old rocker feels "nervous" about getting through the band's North American dates, which begin August 16 in Florida, citing the long-term effects of meningitis and the toll of singing in extreme heat.

He said: "There's a big part of me that's going – I just hope I make it through." Article continues below advertisement

Final Performance?

The Who – Daltrey and longtime bandmate Pete Townshend , 79 – will tour the U.S. and Canada until September 28, when they're due to close with a show at Las Vegas' MGM Grand Garden Arena.

The tour is being billed as their last, and Daltrey is increasingly uncertain whether

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