He has stated this by posting a note on his Facebook account.
"The experience that I have gained through the past 17 years will no longer be needed in the field since I have decided to retire from T20I Cricket marking my retirement from all formats of cricket. But I will be continuously supporting the younger generations who thrives to uplift the spirit of the game and I will always be there with all who love the game. May the triple gem bless you all!", he added to his Official Facebook account.
Malinga also added a note on his Official Twitter account stating his retirement from T20 cricket.