It has been reported that Tottenham tracked Diop carefully for months and made an official approach for the 20-year-old midfielder this week.
The former Spain Under-19 international reportedly has a release clause in his contract close to £25 million.
Tottenham manager Mauricio Pochettino adores the youngster, according to the report, which also claims that there are some similarities between him and Dele Alli when he initially joined the North London club from Milton Keynes Dons.
The youngster is very talented and hugely promising, and Diop would be a good signing for Tottenham.
The fans, though, will have to be patient with him, as he is one for the long-term and is not yet ready to challenge for a place in the Spurs team.