From an ex-Manchester United striker to Chelsea's captain: Out-of-contract players who Middlesbrough could sign this summer

With 12 games to go Middlesbrough's promotion hopes remain in the balance - yet discussions will already be talking place regarding next summer's transfer business.
Middlesbrough manager Tony Pulis.Middlesbrough manager Tony Pulis.
Middlesbrough manager Tony Pulis.

Although a large part of Boro's business will depend on which division they find themselves in come the end of the season, those behind the scenes will already have one eye on potential targets. The free agent market proved successful for the Teessiders earlier this year following the capture of ex-Chelsea midfielder John Obi Mikel - but could Boro profit again? We take a look at some players whose contracts are set to expire this summer. Scroll down and click through the pages to look at some of the players who may be available: