Middlesbrough target Neven Subotic must undergo rib surgery and is expected to be sidelined for the rest of year.
The 27-year-old defender was understood to be in talks with Boro over a potential switch to the Riverside. However, the deal is now off after a medical revealed the extent of the injury.
Borussia Dortmund have confirmed the Serbia international requires an operation and will remain with the Bundesliga club this summer.
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Newcastle United have completed the signing of Arsenal defender Isaac Hayden. The 21-year-old has agreed a five-year deal at St. James' Park and has joined up with Magpies' on their training camp in Ireland.
"Newcastle is a massive football club and to be given the opportunity to come here and progress my career is fantastic," said Hayden.
"Being at Arsenal was a great experience, I learnt a lot there and have a lot to thank them for, but I needed to move on and so when Newcastle came in for me I jumped at the chance.
"I am still young but I want to get as many games under my belt as I can and help the team bounce back to the Premier League."
"We continue with our plan to bring in players who are hungry to succeed and prove themselves, which Isaac really is.
"He is also a player who can play in different positions, which is very useful. "Isaac is a young, strong English player with fantastic potential but also with some experience already of the Championship. We welcome him to the Club."
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Sunderland have said they won't be trying to sign Inter Milan player Davide Santon after talks between the two clubs failed to reach a deal.
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Middlesbrough goalkeeper Victor Valdes is 'proud' to have joined the club after signing two-year deal at the Riverside.
The 34-year-old wrote on Twitter: