Indeed, the Frenchman was quick to blame his defenders for struggling to deal with headers in their own penalty area - something that has troubled Arsenal all season.
But he admits it was the fact Carroll is so good in the air that enabled West Ham to come back from 2-0 down against their London rivals.
The Arsenal head coach is quoted as saying by Sky Sports: "Why did we struggle with Carroll? Because he's good in the air.
"We had a good game but a bad result, and we paid for a weakness we have had all season - headers in our box.
"Yes of course, he was lucky to finish the game, but that doesn't mean we have to concede goals from headers; we have to look at ourselves."
But the fact Arsenal let a lead slip was no surprise to anyone.
The result, however, does neither side any favours. West Ham are now further behind Manchester City and still behind Manchester United. Arsenal, meanwhile, are once again at risk of being caught by City.