Arsenal defender Per Mertesacker says they must learn from victory at Crystal Palace.
Arsenal survived a late rally from Palace to win 2-1.
"At the end they tried to put us some pressure and get some strikers on," the defender said. "They nearly scored the equaliser so we were a bit lucky at the end. Overall, we are absolutely delighted with the three points and we move on.
"They have pace up front and good headers of the ball too. They nearly scored in the first half and at the end they had quite a few chances.
"Sometimes you lose games, especially at the end. We were lucky today but that was a bit of a warning for us not to switch off too early.
"As I said, I'm absolutely delighted to take the three points."
