24-year-old Castagne has joined the English side for a fee of €24m (£21.5m) and penned a five-year deal.
— Leicester City (@LCFC) September 3, 2020
The seven-time Belgium international spent three years at Atalanta as part of Gian Piero Gasperini’s impressive side.
Castagne is a right-back but can also play on the left, a position in which the Foxes need depth after losing Ben Chilwell.
He is the third national team player of Belgium at the King Power after Youri Tielemans and Dennis Praet.
Atalanta are moving quickly to replace Castagne by bringing in Rick Karsdorp from Roma.