SUNDERLAND’S search for a goalkeeper has taken them to Middlesbrough after showing an interest in Dimi Konstantopoulos.

The Black Cats have been considering a number of options during the transfer window and Leeds United’s Andy Lonergan is also under consideration.

But sources on Wearside suggest Konstantopoulos is high in Chris Coleman’s thinking knowing he had a key role to play in Middlesbrough’s promotion-winning campaign in 2015-16.

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The 39-year-old, who turns 40 in November, keeps himself fit and has been ready for the call this season after playing back-up to Middlesbrough’s £5m signing Darren Randolph.

Middlesbrough, who only have forgotten man Tomas Mejias with any first team experience as an alternative, could face a decision whether to let him go.

Former Hartlepool goalkeeper Konstantopoulos is out of contract in the summer but has been at the Riverside since August 2013.

Even though the experienced Greek goalkeeper – who has only played three times this season in the EFL Cup – lost his place in the Premier League following the arrival of Victor Valdes, he has always been well liked by fans on Teesside.

Konstantopoulos smashed a 30-year-old Middlesbrough club record of nine consecutive clean sheets during the promotion year when he kept 22 clean sheets in total.

Sunderland have also been keeping an eye on Lonergan’s situation at Leeds, with Coleman keen to add to his goalkeeper options after inheriting Jason Steele and Robbin Ruiter from Simon Grayson.

Coleman is looking to make further signings before Wednesday’s transfer window closes having only been able to land Kazenga LuaLua and Jake Clarke-Salter so far.

Derby striker Chris Martin is on the radar but there has been no decision while he assesses his options. Reading are also keen.

Young winger Rees Greenwood, meanwhile, has joined Gateshead after being released by Sunderland. The 22-year-old has struggled with injuries since making his debut in 2016 and he has joined Heed for the rest of the season.