Crystal Palace are in talks with Sporting Lisbon over a move for centre-back Ousmane Diomande.
The FA Cup holders are looking to strengthen their defence this summer given the uncertainty over the future of skipper Marc Guehi, who has just 12 months to run on his contract.
Diomande, 21, is a serious target for Palace but it remains to be seen whether the clubs can reach an agreement for the central defender, who has also attracted interest from across Europe.
The Ivory Coast international is valued at around £40 million, a fee that would smash the club's current transfer record of £32 million for Christian Benteke in 2016.