Frei, who plays on the left side of midfield, has joined on a three-and-a-half-year deal for an undisclosed fee.



He becomes the fifth player to be added to the Blues squad in less than three weeks.



Frei was born in Austria but grew up in Switzerland and played youth football for Swiss side Grasshoppers, before making the switch to England in 2010 to join Fulham’s youth academy.



His debut for the Cottagers came at the age of just 17 when he played in their Europa League fixture against Runavik.



He was later allowed to go out on loan to Cardiff City, where he made three appearances.



In total, during his time at Craven Cottage he made 33 appearances - 23 of which came in the Premier League.



After three years with the Londoners, Frei was snapped up by Besiktas for a reported fee of £3 million.



He subsequently went on to make 83 appearances and score seven goals for the Turkish giants, including nine appearances so far this campaign.



Internationally, Frei has been a Turkish international since 2012 and currently has five caps for his country.



Frei will wear the number 21 shirt at Blues.





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