Arsene Wenger claims Fabinho was guilty of cheating after Alexis Sanchez was sent off for catching the Brazilian with a high challenge.
The Inter Milan forward was given his marching orders after picking up two yellow cards, the second for a tackle on the Liverpool midfielder as the Italians were knocked out of the Champions League.
It came at the worst possible time for the visitors, moments after Lautaro Martinez's stunning opener, completely derailing any momentum Inter had as the second leg of the last 16 tie finished 1-0 with the Reds progressing to the quarter-finals.