Arsenal striker Olivier Giroud says they must not underestimate FA Cup opponents Middlesbrough.
Giroud admits the Gunners are taking nothing for granted as the Championship side aim for another upset.
"If they are here it's because they succeeded in beating a great team like City, so we need to be aware of that," Giroud said.
"We need to play our game straight away from the beginning and not let them take confidence.
"It will be a tough game, especially in the FA Cup. We know that even though a team is playing in an inferior division, they will really want to beat us at home, especially Arsenal.
"We are really cautious and we want to start the game on the front foot.
"Every game is a tough game in the FA Cup. It's always a big fight.
"We have the spirit because we won it last year, we have more experience maybe and hopefully we will keep this trophy with us."
