Newcastle United are going to go big on a centre-back during this summer’s transfer window, but it remains unclear which one. For a long time, it looked like AC Milan’s Malick Thiaw was the top target, as Newcastle United eyed a right-sided centre-back to come in and be Fabian Schar’s long-term successor. Eddie Howe praised Thiaw in the media, with a deal seemingly heading in the right direction. Newcastle held talks with Thiaw’s agent, but then the rumours went quiet. Newcastle approach Crystal Palace for Marc GuehiAs Thiaw talk went silent, the Magpies began to make a new racket by trying to…