Kieran Tierney limped off during Thursday's win over Southampton.
But Mikel Arteta insists it is nothing to worry about ahead of Sunday's Emirates FA Cup quarter-final clash with Sheffield United.
"Kieran was cramping," our head coach told Arsenal.com. "He hasn't played two games together in the last seven or eight months and he was suffering. The weather is different to Scotland and he needs to adapt to it.
"I think we defended really well," Arteta added. "The second half with the way they cleared the ball away. For a long time we had to defend deeper with a lot of numbers there and we suffered, but they were in the right positions, helping either other.