Tharanga, who scored two runs off 20 deliveries in the match at Mumbai's Wankhede Stadium, was called in after investigators quizzed chief selector Aravinda de Silva for almost six hours on Tuesday.
Batting first, Sri Lanka scored 274 for six and removed Sachin Tendulkar for just 18 to leave India on the backfoot after the eventual winners lost two wickets for a meagre 31 runs.
The International Cricket Council is said to be investigating three unnamed former players over corruption claims, while Sri Lanka's captain in the final, Kumar Sangakkara, is encouraging Aluthgamage to share his allegations with the governing body. "Today we started the investigation into (2011 World Cup) match fixing allegations", Fonseka told reporters outside his unit's office where the chief selector was questioned.
"I can not reveal everything now, but one day I will. I think in the interest of Sachin and the millions of cricket fans across India, it's the duty of the Indian government and their cricket board to initiate an impartial inquiry to see whether they have won a fixed World Cup", De Silva had written in his column in The Sunday Times.
"He needs to take his "evidence" to the ICC and the Anti corruption and Security Unit so the claims can be investigated thoroughly", he tweeted.
Global cricket in Sri Lanka has previously been linked to corruption allegations, including claims of match-fixing ahead of a 2018 Test against England.
Matt Hancock: ‘My heart goes out to the people of Leicester’
Harsher restrictions are coming into force in Leicester following a surge in the number of coronavirus cases in the city. What support is available for the people of Leicester? Mr Hancock added: "We are providing funding for local support".