Arsene Wenger has admitted he was wrong to attack the referee for the penalty he awarded to Burnley.
The frenchman was sent off in injury time, after having strong words with Ben Moss, who awarded a penalty to Burnley after Coquelin fouled Ashley Barnes.
Burnley were able to equalise from the spot with Andre Gray, only for Sanchez to get the winner from the spot after Ben Mee fouled Koscielny.
“My view is that honestly I did not see that it was a penalty,” Wenger was quoted as saying by the BBC when asked about Burnley’s spot-kick.
“I will have to watch it on the video. Francis told me that he ran into him. Myself, I should have shut up and I apologise for not having done that. It was nothing malicious. I should have kept my control, even if it was in a hectic time.
“I didn’t see any penalty from outside but I should have shut up and I apologise, even if I was frustrated.
“We finally got the win but of course it was very difficult for us. We couldn’t get the second goal, we played with 10 men and they played well as well. In the end we got the three points we wanted.
“Burnley are well organised, they make the game simple but efficient. We won there in the last second and we won again in the last second today,” he added, referring to Koscielny’s last-gasp winner at Turf Moor in October.
“Every week and every game is an unbelievable fight for everybody.
“We kept going, we are a relentless team. Burnley made it very uncomfortable for us.”
Burnley manager Sean Dyche, meanwhile, took issue with the assistant referee, who failed to spot that Koscielny was seemingly in an offside position prior to Mee’s foul.
“It’s a tough day for us in the end,” he was quoted as saying by the BBC.
“To lose a game in that fashion, with an offside not given is tough, particularly when you come to tough places like this.
“We never take anything for granted. We know how tough this division is but you need officials to make the right decisions and that is the shame today. They have to be brave have officials at places like this, I understand that, but you’ve got to think it has to be given.”