Manchester United legend Ruud van Nistelrooy has suggested that a rumoured Arsenal transfer target could soon become ‘world-class’. The Gunners are set for a big summer with Mikel Arteta expected to bring in a number of signings to take Arsenal to the next level, with Athletic Club star Nico Williams linked with a move this weekend. With Crystal Palace playmaker Michael Olise also rumoured with a move to Arsenal in recent days, the Gunners are clearly after a certain profile of player in regards to wide-attackers this summer. And Van Nistelrooy has suggested that one such figure linked with Ar…