Roma midfielder Daniele De Rossi is facing a UEFA ban.
Both De Rossi and Emerson Palmieri were sent off for straight red cards during the 3-0 Champions League play-off defeat to Porto.
De Rossi's foul was considered more dangerous, having forced Maxi Pereira to undergo surgery with a two-month lay-off.
As he was also the captain in that game, De Rossi will be handed a three-match ban by UEFA.
Emerson Palmieri receives a two-game suspension and both will have to be implemented in the Europa League.