The Spaniard bit Donati on the arm in injury time in scenes that evoked memories of Luis Suarez, who was suspended three times for biting earlier in his career.
VAR spotted the incident, with Patric not protesting when a red card was shown.
The 27-year-old was also fined €10,000 on Wednesday.
Donati said he was not hurt by the bite and that Patric immediately apologised.
"He did nothing to me and apologised straight after, so bear that in mind," he told ANSA after the game.
"I also live with emotions so I understand Patric why, in such a hard-fought game, did what he did. Patric apologised straight after. His gesture was rightfully punished with a red, but it didn't do me any harm. Therefore, I'd ask people to think long and hard before judging him."