Michael Ballack insists Arsenal will represent a real danger when they face Chelsea at Stamford Bridge despite the dressing room turmoil sparked by defender William Gallas.
The France international was stripped of the captaincy by coach Arsene Wenger after publicly claiming all was not well within the Arsenal camp.
But Ballack believes the recent events at the Emirates Stadium can make their London rivals a real threat, saying: ""Because they have problems in the team, they are dangerous and we have to be aware especially after Wednesday's game against Bordeaux."
He added: "We hope we can beat them as it would be a lot for Arsenal to come back.
"Arsenal have other problems now but such teams are very dangerous at these moments.
"If you are on top of the league it is always a little bit different. They have to win to close the gap. We are on top and they are 10 points behind us. They have to win as well.
"The team has a target to be champions after finishing second twice but everyone is hungry and the focus is there."
Chelsea will go into Sunday's important game after yet another disappointing away performance in Europe.
The 1-1 draw with Bordeaux in the Champions League on Wednesday night now leaves them requiring a win against CFR Cluj in their final Group A game to ensure qualification to the knockout stages.
Ballack added: "We were lucky to get a point on that performance. It was not a good game from us. It looks like the group stage this year is more difficult than we expected."
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