Former Australian captain Ricky Ponting today announced his retirement from Test cricket with this week's Perth Test against South Africa to be his last. Speaking at a hastily-called press conference in Perth he said,he has let the team to know that this upcoming Test will be his last.The former Australia skipper, who turns 38 next month, has failed in three innings against the Proteas during draws in Brisbane and Adelaide and pressure was building on the 167-Test veteran ahead of Friday's third Test in Perth.