Tom Huddlestone believes that Manchester United have to build their team around four academy players in the future. Erik ten Hag has a mixed record of bringing through youth talent at the club with several promising players leaving this week. Alvaro Fernandez joined Benfica on an initial loan with the Portuguese side having to make it permanent if he starts 50 per cent of their games. Hannibal Mejbri has also departed the club this week as he joined La Liga side Sevilla. The Tunisian also joined the La Liga side on an initial loan with the Spanish giants having the option to make that deal per…