Sir Alex Ferguson's retirement has left Manchester United in a transitional phase.
The long-serving Scotsman leaves the club in the able hands of former Everton manager David Moyes, a man he hand-picked himself.
Sir Alex steered the Red Devils to the Premier League title in his final campaign, comfortably conquering all in his path.
Moyes faces a tough assignment of trying to replicate his predecessor's success.
Here are the seven biggest potential obstacles to United repeating as EPL champions.