Sir Alex Ferguson believes Chelsea will provide the greatest threat to Man Utd this season, not Liverpool.

The Red Devils boss is hoping to lead his side to a fourth consecutive Premier League title, and knows competition for the crown will be fierce.
Liverpool pushed United all the way last season, eventually finishing just four points off the pace.
They are expected to challenge again in the 2009/10 campaign, but their chances of tasting top-flight glory have been all but written off by the manager of their fiercest rivals.
Ferguson insists Chelsea, under the guidance of new coach Carlo Ancelotti, are causing him greater concern heading into the new season and claims Liverpool will struggle to replicate their heroics of last term
(Source: Skysports)