Manchester United appear to be at it already. After last summer's nightmare of a transfer window, the club - without a manager - have already started their business this time around.
Reports have suggested that the Red Devils have submitted a bid for Southampton full-back Luke Shaw. However, United will be well aware that they can't stop there.
In-fact, Manchester United need a major rebuild this summer, as they look to recover from a disastrous campaign.
And, whilst the left-back position appears to be a priority, many around Old Trafford will know that the midfield area must be strengthened this season.
Of course, Belgian midfielder Marouane Fellaini was signed on deadline day of last summer, however he struggled in his debut season at the Theatre of Dreams.
Then there's the likes of Michael Carrick, Darren Fletcher and Tom Cleverley, who haven't really been able to stamp their mark on the side this season.
The latter - Cleverley - has come in for huge criticism throughout the campaign. And perhaps it's time for him to move on this summer.
The England international - who has been placed on Roy Hodgson's standby list for the World Cup - is in need of a fresh challenge, and there is one manager who would love to take him on.
Everton boss Roberto Martinez is reportedly ready to take him to Goodison Park for around £15 million, and United should let him depart - for his own good.
Cleverley isn't a bad player and can still have a bright future in the game, but Manchester United aren't the right club for him.
And if Manchester United are clever, then they will look to bring Barkley - a player the club have shown interest in - to the club as part of the deal.
There's no doubt about it, Barkley is one of the most exciting prospects in the game right now and will become a superstar in years to come. He can get around the pitch, score and create goals, and has the ability to dominate midfields for many years to come.
The central-midfielder is exactly the type of player United need, and exactly the type of player the Red Devils usually go for. Young England stars are key to the future of Manchester United.
So, by selling one England midfielder in Cleverley, bringing Barkley to the club would be some coup for the new Manchester United boss.
Barkley may well be rated highly - £38m in-fact - but he's worth the risk, and could become an Old Trafford great. Cleverley, however, must try and climb up the footballing ladder once again - starting at Goodison Park.