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Middlesbrough FC are fine-tuning a deal to sign defender Fabio da Silva after agreeing a fee with Cardiff City.

Boro have made nine signings ahead of the new Premier League season, and former Manchester United left-back Fabio has been widely tipped to become the club's 10th addition.

Last night, it was reported that Boro had agreed a fee - thought to be in the region of £2m - with the Bluebirds for the 26-year-old, who has one year left on his current contract at the Welsh club.

The Gazette understands that while a broad outline for the move has been agreed, negotiations between all parties are ongoing.

Boro have been working on a number of defensive targets ahead of Saturday's Premier League opener against Stoke City, but are unlikely to land a centre-back in time for the curtain-raiser.

However, the club are confident to press ahead with the left-back position, and Fabio could become the latest arrival through a busy Riverside entrance door this summer.

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Two-cap Brazilian international Fabio was left out of Cardiff's matchday squad at the weekend, with manager Paul Trollope admitting he expects a resolution in the coming days.

"Coming into the first game of the season we wanted everyone fully focused on the job in hand," Trollope told the BBC.

"The timing wasn't great for us but hopefully there will be a resolution next week.

"There has been an interest from another club and that was the reason he was left out."

Fabio joined Cardiff from Manchester United in January 2014 and has made more than 60 league appearances for the club.