Malinga, who led Sri Lanka to the ICC World Twenty20 title in Bangladesh earlier this month was originally the vice-captain, but was promoted in the last group game against New Zealand while Dinesh Chandimal, the appointed skipper, served a suspension for a slow over-rate, and then decided to sit out for the rest of the matches due to lack of form.
Chandimal had taken over the T20 reins from Angelo Mathews in 2013 and had led Sri Lanka in 12 games, of which it had won eight.
Malinga will be assisted by Lahiru Thirimanne, who has been named the vice-captain for T20 and One-Day Internationals, as well as Tests.
Meanwhile, Angelo Mathews, who led Sri Lanka to the Asia Cup win in March, has been retained as the captain of the one-day team and will lead the side in the 2015 World Cup in Australia and New Zealand.
Mathews, who was also at the helm during the team’s tour of Bangladesh in February, winning the three-Test series 2-0, will continue as Test captain, SLC added in a release.
Sri Lanka travel to the United Kingdom in May for two ODIs against Ireland, and five ODIs, one T20 and two Tests against England.