* Former Porto boss signs three-year contract
* Returns to Stamford Bridge after earlier scouting role (adds details)
By Mitch Phillips
LONDON, June 22 Andre Villas-Boas became the seventh manager of the Roman Abramovich era at Chelsea on Wednesday as the 33-year-old, who resigned from Porto on Tuesday, agreed to a three-year contract at the west London club.
Villas-Boas, who led Porto to a domestic double as well as winning the Europa League last season, replaces Carlo Ancelotti, who was sacked in May after failing to win a trophy in his second season having won the Premier League and FA Cup in his first.
Villas-Boas, who becomes the youngest manager in the Premier League, moves to London after Chelsea paid 13.3 million pounds ($21.5 million) to trigger an escape clause in his contract.
"Andre was the outstanding candidate for the job," said a statement on the Chelsea website (www.chesleafc.com).
"He is one of the most talented young managers in football today and has already achieved much in a relatively short space of time," the statement continued.
"His ambition, drive and determination matches that of Chelsea and we are confident Andre's leadership of the team will result in greater successes in major domestic and European competitions.
"Andre will bring his coaching experience back to a club he is already very familiar with, having previously worked here for three years.
"He has always been highly regarded at Chelsea and everyone here looks forward to welcoming him back and working with him."
Villas-Boas worked at Chelsea as a scout under Jose Mourinho, who left Porto seven years ago to join the Premier League club.
Although highly-rated for his achievements at Porto, where he brought success with style in his 20-month reign and was unbeaten in the league last season, Chelsea initially seemed set to return to Guus Hiddink in their search for the man to finally bring them the Champions League after so many near-misses.
The Dutchman, who enjoyed a successful spell as caretaker boss at Chelsea in 2008-09 and has a close relationship with Abramovich from his days as Russia coach, is currently Turkey's national team manager but speculation that he might still arrive as director of football has cooled.
Former Chelsea midfielder Ray Wilkins, sacked as Ancelotti's assistant last November in a move blamed by many observers as contributing to the team's decline through the season, welcomed Villas-Boas's appointment.
"We've had lots of older coaches come in at Stamford Bridge and they've not done as well, so we have to give this young man the credit for what he has done up to now," Wilkins told Sky Sports News.
"Let's give the young man a chance, he's obviously done exceptionally well. His man-management skills from what I can read from the players he has worked with have been first-class.
"That will be required at Stamford Bridge because these are big players, big guys, and it will be very interesting to see how this young man goes on."
Villas-Boas, who proved a shrewd operator in the transfer market, is likely to try to persuade Porto's Colombian striker Falcao to follow him to Chelsea after his prolific season, which included 17 goals in the Europa League alone.
With Fernando Torres, Didier Drogba and Nicolas Anelka all vying for a starting role up front, the addition of Falcao would give Villas-Boas formidable firepower.
(Editing by Justin Palmer; To comment on this story email email@example.com)
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