By David McDonnell Manchester United could struggle to attract the world’s best players and slide deeper into crisis following their shambolic Champions League exit. That is the view of United’s former first-team coach Rene Meulensteen, who claimed the ramifications of their European implosion could be far-reaching. United missed out on Harry Kane and Declan Rice in the summer, with Erik ten Hag settling for alternative targets who have been nowhere near as effective. Meulensteen, who spent six years as Sir Alex Ferguson’s coach at United, reckons the fallen giants could find it hard to recove…