Vaas left his position last month at the end of his contract. He was said to be having a rough relationship with head coach and former team-mate Marvan Atapattu.
     
Ramanayake will be in charge for the next three international home series against Pakistan, India and the West Indies.
     
Ramanayake, a former fast bowler, played 18 Tests between 1988 and 1993.

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