Manchester United to appoint three-time Champions League winning manager Zinedine Zidane as the club's new head coach.The Red Devils have this week stepped up their efforts to appoint their next permanent manager at Old Trafford as club chiefs interviewed Ajax boss Erik ten Hag on Monday. The Dutchman is one of two frontrunners for the job alongside Paris Saint-Germain head coach Mauricio Pochettino.The pair are believed to be joined on United's four-man shortlist by Sevilla's Julen Lopetegui and Spain national team boss Luis Enrique.