Both clubs have yet to confirm the deal .
Both clubs declined to comment on Thursday , but Spanish and Italian media reported the fee was 15 million euros ( $21.4 million ) plus another 3 million euros linked to objectives .
Both clubs have yet to confirm the deal and declined to comment on Thursday , but Spanish and Italian media reported the fee was 15 million euros ( $21.4 million ) plus another 3 million euros linked to objectives .