Arsenal were dealt a blow before kick-off when Gabriel Martinelli, who only recently returned from a serious knee injury, suffered an ankle issue in the warm up and was forced to miss out after being named in the starting XI.
Arteta admitted: “I am gutted. I was in my office before the game and one of the coaches came in and said Gabi hurt himself and twisted his ankle.
“I went to the medical room and he was in tears and in a lot of pain. We are going to have to see how he is. It didn’t look good, he was in pain so I imagine we are not going to get good news with him.”
Martinelli will go for a scan but is expected to miss Thursday’s home fixture with Crystal Palace in the Premier League.
“It is his character that he wants to play the next game, that he doesn’t care and can handle pain,” Arteta said.
“Hopefully there is nothing too serious, but to start with it didn’t look good.”