The Daily Mail says Spurs manager Harry Redknapp is weighing up various options and the 25-year-old, capped 26 times by Costa Rica, has a £13.75million release clause.
Ruiz said: "They have approached my agent. I was told about Tottenham's interest two days ago.
"Spurs are a great club. I'd say that the chance that I'll leave Twente is 50 per cent."