Ruiz claims Tottenham have been in touch with him about a move to White Hart Lane.
"I hope that my goal has removed any doubt from the minds of Spurs and any other clubs," he told Voetbal International.
"The reluctance of clubs (to sign me) cannot be to do with my technical skills. I showed what I can do last season with Twente.
"My physical condition is not a concern. I am fit."