SYDNEY - Australian captain Michael Clarke said Tuesday he believes he can play all five Ashes Tests against England and has years of cricket left in him, despite being plagued by chronic back problems. Speaking to reporters on the eve of his expected comeback from injury to lead New South Wales in a Sheffield Shield match against Tasmania on Wednesday, Clarke said he was ready. "Right now I feel fit and healthy," he said before a final fitness test. He batted away speculation about early retirement due to his lingering back troubles, saying: "I certainly don't believe that my back will play a part in regard to shortening my career." Clarke said in his column. "While there is ongoing speculation about my future, my back is no worse now than it has been for years," he wrote. –Agencies