Regis Le Bris will be concerned about one potential problem after Sunderland beat Middlesbrough. The Black Cats played host to their local rivals Middlesbrough on Saturday, September 21st. Regis Le Bris watched on as Sunderland lost 3-2 to Plymouth Argyle in their previous league outing. It was a surprisingly poor performance from the North East outfit, whose defensive errors cost them three points against Wayne Rooney’s men. And after beating Boro just once since an FA Cup clash in 2012, the Sunderland faithful were no doubt slightly concerned a second defeat in a row was on the cards this we…