The Argentine coach previously worked with Juan Martin del Potro and, most recently, Grigor Dimitrov.
Fognini recently split with former coach Jose Perlas, who is now working with Serbian Dusan Lajovic.
The 29-year-old Fognini, who married retired player Flavia Pennetta during the season, has dropped to No. 49 in the rankings following a series of inconsistent performances.
In off-the-court news, the veteran has announced that he is changing apparel companies, having previously competed in Adidas.
Fognini was ranked as high as No. 7 in 2015.