Moshiri told the club's website: "He has one of the most impressive CVs in world football. He knows how to build winning football teams. Look at the job he did at Valencia, for example.
"At a time when Real Madrid and Barcelona were investing heavily in global superstars, against all odds he led Valencia to their first La Liga title in 31 years, and then added another La Liga title and a UEFA Cup for good measure.
"He has demonstrated at a number of clubs he can help them take the next step – and step up to the very highest level.
"We spoke to many people in the game during our search and the feedback we had on Rafa was extremely positive.
"He's considered to have one of the best tactical minds in the game and I think his experience and know-how will be vital in helping us to push up the table and into the European places.
"In our personal meetings with him, that vast knowledge and footballing intelligence was very evident – and very impressive."
Moshiri also stated: "It was important for us to take our time and find the right person.
"We identified the qualities we wanted, and then spoke with various candidates. It was a thorough and extensive process.
"We were determined to do our due diligence, identify a shortlist of strong candidates who fit into our vision for the club and, ultimately, appoint the right man - and I believe we have done this."
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