Arsenal boss Mikel Arteta admits their form is a "real worry" after defeat at Southampton.
Jan Bednarek scored the winner for Saints.
Arteta said: "It's a really difficult one to take. The way we controlled the game makes it difficult to understand how we lost the game.
"We didn't hit the target many times and the end product was not as good as it can be. We conceded a very sloppy goal from a set-piece. When you have the amount of situations we created, you need to score three or four.
"The way we defended for the goal wasn't good enough. You saw how the team tried. More than ever now, I want to be close to them.
"Forster was incredible, the saves that he made today. It was a defining moment. That's why I say the box has decided the game today. You could see the game was one-way traffic."
On Arsenal's form, he added: "It's a real worry. We've lost games in different ways. To lose the way we did today is difficult to explain. If you saw the game, you'd say Arsenal had won comfortably.
"We performed but didn't get a result. We need both. You have to put the ball in the net. You have to make the decisive moments count to win football matches and at the moment we're not doing that."
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