Switzerland's attorney general has received documents from the European football confederation (UEFA) on a purported 1998 salary agreement between Michel Platini and FIFA, material which could shed light on the questions surrounding the Frenchman.

Platini, UEFA's president, is not facing criminal charges in Switzerland, but the country's top prosecutor has questioned him concerning a $2 million dollar payment he received from FIFA in 2011, reportedly for work done a decade earlier.

Platini's lawyers have produced a document from a UEFA executive committee meeting on November 12, 1998, which they claim exonerates their client by proving the existence of an oral contract with FIFA.

On Monday, Swiss prosecutors "requested a document from (UEFA) in terms of which it was allegedly planned to make a salary payment of 1 million Swiss francs to UEFA President Michel Platini if he were appointed sports director at FIFA", a statement from the attorney general's office (OAG) said.

"The OAG served a formal request on UEFA and documents have already been handed over and seized," it added.

The OAG said it was specifically "interested in the meeting of the UEFA executive committee on 12 November 1998, at which a rumoured salary payment" was discussed.

The statement noted that "ultimately, Michel Platini was not appointed FIFA sports director".

The significance of Platini not getting the job remains unclear, but Swiss investigators may be questioning whether Platini was ultimately paid -- a decade later -- for work he never did.

The Swiss criminal investigation targeting Blatter alleges that the 2011 payment of 2 million Swiss francs ($2 million/1.8 million euros) Blatter made to Platini was "disloyal" to FIFA.

Both Blatter and Platini were suspended by FIFA for 90 days in October, shortly after Switzerland announced the criminal probe.

Platini's status in the Swiss probe falls between a witness and an accused.

The OAG also said it had requested further information concerning the sports director job at FIFA, including why Platini was considered but ultimately not chosen.

"FIFA was requested to hand over various documents" on this subject, the OAG statement said, without stating whether the material had been delivered.