straight to your inboxOwen Hargreaves believes Manchester United need four players to become genuine challengers.The Reds crashed out of the Europa League following defeat to Sevilla, the Spanish club coming from behind to progress with a 2-1 win.The defeat means United's long season is finally over, but while it yielded some improvements - a top four finish and a good run in a European competition - Ole Gunner Solskjaer and his men still aren't where they want to be.And to fix that ahead of