We may be favourites to progress from our Europa League quarter-final with Slavia Prague, but the Czech's side record speaks of their threat.
Two seasons ago, they won a point against both Barcelona and Inter in the Champions League, and in the Europa League they can boast victories against the likes of Sevilla and, this season, Leicester and Rangers.
Mikel Arteta certainly is not taking them lightly.
"They are a really strong side," he said. "I think in the last few years, competing at the highest level, they've always been in the game and made it really difficult.
"[They're] really competitive, brave, very direct and incisive and a team that can cause you problems throughout the game. They never give up, they have a top attitude all the time and that's why they beat teams because they're a really good side.
"I would like to highlight the collective performance they put in. Obviously, they have some really good individuals, they have had some really good players that they've sold in recent years.
"The market is looking at them because they've been a really good side. We know that they have some really interesting players there."
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