By Simon Mullock Jordan Henderson’s debut for Ajax could be delayed… by Brexit. The Amsterdam club have started the process of securing a work permit for the England midfielder following his arrival from Saudi Pro League club Al-Ettifaq, which is now a necessary requirement following the UK’s departure from the European Union. But cutting through the red tape could take as long as two weeks – which would leave Henderson waiting until February 3 to make his Eredivisie bow in a mouthwatering home game against runaway leaders PSV Eindhoven. If Ajax can fast-track the 33-year-old’s application -…