Key players have piled up extra minutes at the World Cup and signing Vinícius Júnior would smash their wage structureAfter beating MK Dons 3-0 in a training-ground friendly last weekend, Arsenal truly begin their pre-season programme against Girona on Saturday evening. It marks a return to action for the Premier League champions, who will want to show their success last season was not a one-off.Retaining the English title is incredibly difficult if you are not Manchester City. No other club has done it since Manchester United won three in succession from 2007 to 2009. Chelsea have done it once, Liverpool have not managed it for more than 40 years, and it is the best part of a century since Arsenal retained the crown. Mikel Arteta faces a sizeable challenge. Continue reading...