Sri Lankan speedster Lasith Malinga has announced his retirement from Test cricket because of a "long-standing degenerative" knee injury. Malinga's sling-arm bowling action and devastating yorkers proved to be a nightmare for batsmen the world over. Accused of choosing the cash-rich IPL ahead of national duties by his own cricket Board, the 27-year-old Malinga said that he would continue to be available for ODIs and Twenty20games for his country. The surprise announcement from Malinga, regarded as the fastest bowler produced by Sri Lanka till date, is being interpreted as a move to put an end to the selection dispute with his cricket establishment which wanted him to return from the IPL for a rehabilation programme. Malinga said in a statement. in Mumbai today that although he is sufficiently fit to play both ODI and T20 cricket, he has a long-standing degenerative condition in his right knee that needs to be carefully managed. Malinga, who pulled out of Sri Lanka's upcoming Test tour of England citing fitness woes, has been leading the wicket's tally for Mumbai Indians in the ongoing IPL.