The Spaniard, who is also said to be wanted by Manchester United and Leicester City, has a £13.2 million release clause.
Spanish outlet Marca claims Betis are set to offer Ruiz a new deal that will see his value rise.
The 21-year-old has made 15 appearances in La Liga this season, scoring twice and providing two assists.
Spurs have been linked with a number of midfielders over the last few weeks following suggestions the club is targeting a long-term replacement for Mousa Dembele.
The Ruiz story hasn’t been picked up by any credible publications in England – until then, it’s merely speculation.