Elected Governor of Buenos Aires Province in 1999, he issued the provincial Patacón bonds in August 2001 to deal with the scarcity of Argentine pesos when the 2001 Argentine economic crisis entered its most acute phase.
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The election of Mayor de la Rúa as President in late 1999 resulted in the project's raplacement and Sileoni's appointment as Director of Secondary Education and Undersecretary for Buenos Aires Province Governor Carlos Ruckauf.
He was appointed Provincial Director of Funding Policy and Public Credit for the Province of Buenos Aires by Governor Felipe Solá in 2004, during which tenure he managed the redemption of the remaining Patacón bonds issued as complementary currency by Governor Carlos Ruckauf during the depths of the 2001 crisis.