The English midfielder, who can also fill in at left back, has left the champions after finding his first team opportunities limited in recent months.
But his new manager Silva believes the player still has a lot to offer at the highest level.
He said: "When I look to bring a new player into our squad, the first thing I look for above all the other things is quality and Fabian is a player with high quality.
"But what they can bring to our dressing room is also important and if you can put those two things together then that can only be good for the club."
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