The Sunderland squad were back in business at the weekend as they returned for pre-season testing. Training officially begun again at the start of the week, with Regis Le Bris taking his first session since being appointed head coach last month. Sunderland are set to kickstart their pre-season friendlies with their annual meetings against South Shields and Gateshead next weekend, with two separate teams likely to feature as both matches take place on the same day. The Black Cats will then jet off to Costa Blanca for a week-long training camp, in which they will take on Nottingham Forest and Sp…