Fifa has confirmed that Jack Warner will appear as a witness in the continuing ethics committee investigation into bribery claims.
Warner, who had been suspended pending an investigation into bribery allegations, resigned as a Fifa vice-president on Monday.
"Mr Warner will be investigated as a witness but not as an accused party," read a Fifa statement.
Fifa added that Warner had offered his support to the ethics committee.
Former Concacaf federation president Warner and Fifa member and former presidential candidate Mohamed Bin Hammam were suspended after executive committee member Chuck Blazer alleged that violations of Fifa's code of ethics occurred during a meeting organised by the two men in May.
Warner and Bin Hammam were accused of giving or offering bribes of £600,000 to Caribbean associations.
They both denied any wrongdoing but were suspended on 29 May pending further investigation by the ethics committee.
After Warner quit, Fifa released a statement which stated that "as a consequence of Mr Warner's resignation, all ethics committee procedures against him have been closed and the presumption of innocence is maintained".
Fifa says Warner will be involved as a witness in the continuing investigation into the allegations against Bin Hammam and the Caribbean associations.
In his resignation statement on Monday, Warner said: "I am convinced, and I am advised by counsel, that since my actions did not extend beyond facilitating the meeting that gave Mr Bin Hammam an opportunity to pursue his aborted bid for the Fifa presidency, I would be fully exonerated by any objective arbiter."
Warner claimed he had been "hung out to dry" and that "gifts have been around throughout the history of Fifa".