Real Sociedad has made a shocking David Silva transfer.

The former Manchester City said goodbye after their Champions League exit on Saturday to players and fans only to be unveiled on Monday night as one of the potent signings for the San Sebastian club.

He was a free agent after his City contract ended this season and was good to choose any club of his choice.

The midfielder agreed two-year term with Sociedad and will don the number 21 jersey left by Madrid player, Martin Odegaard who was on loan with Sociedad.

"The time has arrived. Ten years and 13 titles later, it's time for me to say goodbye to the club that has left an indelible mark on my life and career," Silva said during his departure earlier on Monday.

"I look back and it's clear I could not have made a better decision than to accept City's proposal to join their project back in 2010.

"Manchester City and I have grown together. In 10 years, I have developed personally and professionally. I have celebrated many victories and titles and lived through epic moments.

"I have seen my lovely child, Mateo, born and I have even started to feel comfortable under heavy rain!

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"City are a fantastic family. I won't ever forget the way they threw themselves into helping me when I suffered the hardest moments of my life, offering me support and empathy.

"Precisely because of that I want to tell you it has been a real pleasure wearing the sky blue shirt and the captain's armband of our club, sharing the dressing room with the best players and coaches in the world, and working closely with the finest club representatives and board members the game has to offer.

"And on top of that, all the time I had the backing of the amazing fans who have supported me always, through good and bad moments. You are really amazing.

"I hope that City will achieve even bigger triumphs in the future. I am going to support the team from a distance. I am so happy I have shared these unforgettable moments with the City family - you will always be in my heart.

"I want to send every Cityzen a huge hug."

City enjoyed 10 seasons at the club, where he won 11 major honors including four Premier League titles.