Arsenal manager Mikel Arteta said he was "amazed" to see Declan Rice sent off in his side's 1-1 draw against Brighton after "inconsistency" from referee Chris Kavanagh.
Having already been booked for an earlier foul on Brighton's Joel Veltman, England midfielder Rice received a second yellow card four minutes into the second half for kicking the ball away as the Dutch defender tried to take a free-kick.
Nine minutes later Joao Pedro equalised a Kai Havertz opener to continue Brighton's unbeaten start to the season and end Arsenal's 100% record.
"I was amazed," said Arteta.