Newcastle United have been told that they may have to sell one of their key players of the last few years this summer if they want to progress. Newcastle’s long-term aims are to compete with the very best in football, but the financial restrictions in the Premier League are making it very difficult for their owners to really flex their muscles in the transfer market. Speaking on talkSPORT, Tony Cascarino suggested that Newcastle may be forced to sell Callum Wilson in the summer to raise funds and progress the squad for their long-term goals. Newcastle forced to sell some big players this summe…