Arsenal were naive in their defending and paid a painful price, manager Mikel Arteta said after his side's 3-2 friendly defeat against Villarreal left them with back-to-back pre-season losses.

Arsenal, who started their preparations for the new season with victories over AC Milan and Newcastle United before losing to London rivals Tottenham Hotspur, found themselves trailing 2-0 inside 33 minutes against Spanish side Villarreal at the Emirates on Wednesday.

"Today I think the result is painful. I think they were super efficient but we've been naive, especially the way we have defended in open spaces and that's something that, especially the way we play, we have to absolutely nail," Arteta told reporters.

"Today we haven't been good at all in that department and that has cost us the game

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