Tottenham are exploring a deal for Villarreal defender Pau Torres that could see Giovani Lo Celso go the other way.
Spain international Torres has a release clause of £55million while Tottenham value Lo Celso at around £18m.
Tottenham scouts checked on Torres in Villarreal's Champions League semi-final against Liverpool and will focus attention on a deal after being told that Inter Milan defender Alessandro Bastoni is staying with the Italian club following a meeting on Wednesday.
Spurs will face competition to sign the Spanish centre-back with rivals Manchester United and Chelsea both also showing an interest.