Cesc Fabregas believes a series of injuries has been the major contribution for Arsenal's defensive woes over the last few seasons. "Last year, because of a few injuries, we would see a different partnership in central defence every week," he told the club's official website.

"It might have been William (Gallas), Johan (Djourou), Kolo (Toure), whoever, we would have little (injury) problems which made the shape of the team always change a bit."

Fabregas reckons a defensive unit needs to play together regularly.

"I don't think there is anything better in a team than a solid centre-back partnership," he said.

"They know each other well, they play together every three days, they communicate well and understand each other.

"That is what happened with Manchester United. I think they won 10 games 1-0 because they played together regularly and that sometimes can make the difference.

"I think for the last three seasons we have been unlucky with injuries and hopefully this year we can all stay fit."