Sporting CP has received an inquiry from Nottingham Forest regarding centre-back Ousmane Diomande.
According to sources in Portugal, the Midlands club has shown interest in the 22-year-old Ivory Coast international, but no official bid has been submitted yet.
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Diomande has a £68.2 million release clause in his contract, though he may be available for a lower fee this summer.
Multiple reports indicate that new Forest manager Oliver Glasner is keen on securing Diomande, having previously shown interest while managing Crystal Palace.
Despite his young age, Diomande has accumulated over 150 senior first-team appearances, which includes 15 caps for his national team and participation in the recent World Cup.
He has also been a target for Chelsea and has been linked to several other clubs across Europe.
Nottingham Forest has yet to make any signings this summer after narrowly avoiding relegation to the Championship last season. However, they successfully sold midfielder Elliot Anderson for £116 million and David Carmo to Olympiacos for an undisclosed fee.