Sartori has continued to serve in his post on the board at Sunderland and continues to hold a minority shareholding in the club.
The Uruguayan initially stepped down as a director in the aftermath of Kyril Louis-Dreyfus buying a majority shareholding earlier this year, but returned when the new board was appointed.
The current shareholding structure has never been disclosed, though Sartori owned 20% of the club's then-parent company before the takeover.
Sartori has visited the Stadium of Light on a semi-regular basis this season, and has reportedly been looking at the prospect of establishing a network of clubs.
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