Joshi, who took 110 wickets for India in 15 tests and 69 one-day internationals from 1996-2001, had already began working with the bowlers ahead of the first test starting in Dhaka on Sunday, the Bangladesh Cricket Board told local media.
The BCB had hoped to appoint former Australia legspinner Stuart MacGill but talks failed to produce a deal.
Bangladesh face Australia in a test match for the first time since 2006. The second test starts in Chittagong from Sept. 4.
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(Reporting by Ian Ransom in Melbourne; Editing by Peter Rutherford)
