Chelsea welcomed back Jose Mourinho, its 'Special One', as manager for the second time on a four-year contract on Monday.

The Portuguese, who left Real Madrid last weekend, won the 2005 and 2006 Premier League titles in his first spell with the London club but departed in 2007 after falling out with billionaire owner Roman Abramovich.

"I am delighted to welcome Jose back to Chelsea. His continued success, drive and ambition made him the outstanding candidate," said chief executive Ron Gourlay in a club statement.