Sunderland have been told that Southampton’s promotion could now ’cause an issue’ for them this summer. Southampton have already given Sunderland a financial boost after they won the Championship play-off final yesterday, with the club receiving a further £2 million in add-ons from Ross Stewart’s exit. However, the Saints’ promotion could also spell disaster for the Black Cats. The Wearside outfit face losing a number of key players this summer, having ended their own season only six points above the relegation zone. A number of players such as Jack Clarke, Anthony Patterson and Dan Ballard ha…
