The battle to keep hold of their best players has begun for Sunderland, who have now received the first bids of the transfer window. Jobe Bellingham has reportedly received multiple offers for his signature in the opening two weeks of the window, though Sunderland are adamant they won’t sell for less than £20 million. The Black Cats are eager to see Jobe stay at the club and there is a strong belief that his price tag could sky rocket even further in the coming years, having only turned 18 last season. Sunderland could also face interest for Dan Neil too, who has just rejected the club’s openi…