Jose Mourinho is 'The Perfect One', says Chelsea defender Branislav Ivanovic

Chelsea are now 20 unbeaten in all competitions this season

Chelsea defender Branislav Ivanovic has earmarked a new nickname for Blues manager Jose Mourinho - 'The Perfect One'.

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The Portuguese manager has been known as the 'Special One' ever since he announced he was such in his first press conference as Chelsea manager back in 2004.

But with Chelsea now 20 games unbeaten in all competitions this season the Serbian defender, a key part of the Blues' success this season, has offered up a new nickname for the 51-year-old.

"'They call him 'The Special One', but I like to refer to him as 'The Perfect One,'" Ivanovic told FourFourTwo.

Some have suggested that Chelsea could emulate Arsenal's 'Invincibles' and go the whole season unbeaten - the 0-0 draw with Sunderland was the first time that Chelsea had failed to get on the scoresheet this season, and they hold a six point lead at the top of the Premier League.

However, Chelsea do face a tough London derby at home to Tottenham on Wednesday, before heading into the busy Christmas period.

"His results speak for him," added Ivanovic, who has started all but two of Chelsea's matches this season.

"I think that he is the most intelligent coach - he knows what he wants. He knows when to tighten up and when to loosen up.

"He knows what to demand from the team and from an individual player, and he knows how to deal with stress situations and to relax the atmosphere. It's a pleasure and a privilege to work with him."