Arsenal are also searching for points following a 2-1 loss at Dinamo Zagreb.
Kasami said: "Our organisation is different in the UEFA Champions League, facing one of the best teams in England.
"We must concentrate our play and defend well, to have confidence and to avoid mistakes, because whoever makes mistakes loses."
Arsenal face Manchester United this Sunday in a clash that could see the Gunners top the Premier League table should other results go their way.
And Juan Mata, who boasts three goals for United already this season, says the squad is ready for the challenge once they overcome Wolfsburg in the Champions League on Wednesday.
"It’s a big game, no doubt, and we will fight to defend the top place before the international break.
"Personally, I like playing at the Emirates, and I’m sure it’s going to be a good game… I hope United win."
Wenger acknowledges title race wide open after Leicester win [AMBIENT]
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