Chelsea have splashed cash for the Spanish defender with Duffy loaned to Fulham.
Chelsea have completed the signing of defender Marc Cucurella from Brighton.
The south coast side will receive a club record fee for the Spanish defender, who spent just one season with Graham Potter's side.
Chelsea boss Thomas Tuchel explains why he was so keen to complete the deal:
Also departing Brighton today is Republic of Ireland defender, Shane Duffy.
Newly promoted Fulham will be Duffy's home for the coming season.
Leicester manager Brendan Rodgers says the club has no intention of selling Wesley Fofana and James Maddison.
The pair have been subject to interest from Chelsea and Newcastle respectively.
Rodgers has made his message clear:
Westmeath Manager Expects Two Point Onslaught In Wexford
Patchy Laois Wrap League Campaign Against Table Topping Down
Laois And Offaly Begin Minor Hurling Campaign
"Special Doesn't Do These Lads Justice"
Upwardly Mobile Athlone Take On Treaty
Ireland Name Nine New Caps For Six Nations Squad
Panthers Promotion Hopes Dashed On Final Weekend
Colaiste Mhuire Mullingar: All Ireland Champions
Dublin Sink Offaly In Camogie
Lowry Looks On Shaky Ground Since Cognizant Collapse
"Unhappy" Laois Leave Fermanagh With Some Regret
Laois Ladies Football Legend Honoured By County Council
Westmeath School Primed For All Ireland Final Shot
Offaly Relegated After Cavan Defeat
Offaly And Longford Chase Semi-Final Spot In Division Four
Gold Cup Takes Centre Stage On Final Day Of Cheltenham
Offaly TD Demands Stronger Ticket Touting Laws As Six Nations Prices Hit €3k
Offaly Travel To Dublin For Fourth Round Of National Camogie League
Athlone Town Get Title Defence Underway Tomorrow