Liverpool have already been busy during this summer's transfer window.
These must be exciting times to be a Liverpool fan, with Jürgen Klopp at the helm and the Reds playing some of the most attractive, exciting football on the continent.
Klopp has already added some real quality to his rans this summer, in the shape of midfield duo Naby Keita and Fabinho, but many believe that he has to bring in more defensive reinforcements, if they are to truly challenge for the Premier League title this season.
Maguire, 25, has proven his class since joining the Foxes from Hull City last year, and he is now considered to be a first-team regular for Gareth Southgate's England side.
He is tall, powerful and strong in the air, but he is also comfortable playing out from the back, and he would be an exceptional addition to the Liverpool squad - the perfect centre-back partner for Virgil van Dijk.
Cillessen, meanwhile, would be an undoubted upgrade on Loris Karius or Simon Mignolet, despite not being a first-team regular at Barcelona.
The 40-capped Holland international is a superb shot-stopper, and he is also good with his feet - a vital attribute for any goalkeeper playing in this current Liverpool side.
And if Klopp manages to bring the two players to Anfield this summer, Liverpool would surely be catapulted into instant favourites for the Premier League title.