Real Madrid have made a €160 million (US$188.11 million) bid for Paris St Germain's France forward Kylian Mbappe, Spanish and French media reported on Tuesday.
There was no immediate comment from either club.
France's L'Equipe said PSG's position remained unchanged, with the Ligue 1 club determined to keep Mbappe until at least the end of his contract in June next year even if he could then leave for nothing.
Spain's Marca said the move was a first step by Real, who have long had their sights on the 22-year-old World Cup-winner who scored 42 goals in all competitions for PSG last season and has reportedly said he wants to move to Spain.
The As.com website quoted Real sources as saying however that the fact money was not an issue for wealthy Qatar-owned PSG was an obstacle for Real.
Britain's Sky Sports said the offer was made on Sunday.
Any sale of Mbappe would allow PSG to recoup some of the costs of Lionel Messi's salary package after they signed the Argentina forward and six times Ballon d'Or winner from Barcelona earlier this month.
PSG ended last season with only one major trophy, the French Cup, after losing the league title by one point to Lille and crashing out in the Champions League semi-finals.
Real, now managed by Italian Carlo Ancelotti, were runners-up domestically last season to city rivals Atletico.
Mbappe joined PSG from AS Monaco in 2017, on loan initially and then permanently a year later in a deal valued at 180 million euros.
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