Skysports.com understands that Julio Arca has been ruled out of action for six weeks.
Middlesbrough are sweating on the fitness of Julio Arca.
Julio Arca believes Reading's James Harper would prove a sound addition at the Riverside Stadium.
Boro midfielder Julio Arca is expecting an emotional day when he returns to Sunderland.
Middlesbrough captain Julio Arca insists he wants to keep his place in the side after being restored to the starting XI at the weekend.
Julio Arca admits confidence in the Boro camp is high following the club's results in recent weeks.
Middlesbrough manager Gareth Southgate has explained his decision to drop captain Julio Arca.
Julio Arca has put Middlesbrough's recent upturn in fortunes down to sheer hard graft.
Julio Arca could obtain a British passport and be eligible to play for England - but the Argentine has no plans to do so.
Jeremie Aliadiere says the Middlesbrough players are behind their boss despite the recent poor run.
Middlesbrough travel to Reading on Saturday knowing defeat could see them slide into the Premier League's relegation zone.
Julio Arca is hopeful he will return to first-team duties for Middlesbrough this weekend.
Gareth Southgate has been boosted by the news that Mido and Julio Arca are both closing in on a return to action.
Gareth Southgate has hinted Julio Arca, Mido and Fabio Rochemback will not be fit enough to return against Aston Villa.
Middlesbrough star Julio Arca has set his sights on returning to action in December.
Middlesbrough captain George Boateng is still a vital component of the Teessiders' team, says boss Gareth Southgate.
Middlesbrough boss Gareth Southgate is hoping to welcome four key players back into his side for the clash with Everton.
Middlesbrough have received a huge boost with the news that Mido and Tuncay Sanli do not have serious injuries.
Liam Miller's superb late volley snatched a point for Sunderland in a 2-2 draw against rivals Middlesbrough at The Riverside.
Gareth Southgate has spoken of his respect for Sunderland boss Roy Keane ahead of Saturday's derby.
Join the Sky Sports debate on the draw for the group stages of the UEFA Champions League.
The transfer window isn't going to shut for good anytime soon so get used to it, says Andy Gray.
Phil Thompson told Sky Sports News that Liverpool can be fairly content with their CL draw.