Pompey will pay Basle an undisclosed compensation fee for Subotic, 18, who has signed a three-and-a-half-year contract at Fratton Park.
Redknapp said: "Danijel was recommended to us and we brought him over for a few days training. He did well and we´ve decided to take a gamble on him. He´s one for the future and we´ll have to see how he goes."
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