A report by ESPN's 'Outside the Lines' alleges that Mickelson was a "gambling client" of Gregory Silveira, who has pleaded guilty to three federal counts of money laundering. Silveira alleges that the $2.75 million he has pleaded guilty to laundering belonged to Mickelson.
Silveira's comments form part of a plee agreement that he has entered into with authorities.
According to the report, as well as and court documents, in 2010 Silveira, who was "acting as a conduit for an offshore gambling operation", received a $2.75 million transfer from a "gambling client" – who Outside the Lines have named as Mickelson, with the money allegedly earmarked for use in "illegal sports betting". Silveira then transferred the money between his accounts three times which led to the charges of money laundering.
The report states that Mickelson has not been charged with a crime, and is not being investigated. Mickelson could not be reached for comment.