Steve O'Keefe is one of the four spinners in the Australian squad for the India Test tour. Pic/AFP

Sydney: Nathan Lyon and Steve O'Keefe have sought help from two of Test cricket's greatest spinners ahead of Australia's series in India later this month. The front-line pair approached New Zealand's Daniel Vettori and Australia's chief destroyer in Sri Lanka last year, Rangana Herath, for advice ahead of the four-Test tour, which starts on February 23 in Pune.