The former Blaugrana boss led his side to 12 trophies, two of which were Champions League titles, during a four-year tenure.
However, since leaving the club last summer, rumors have surfaced that Guardiola hired a surveillance team to keep tabs on Ronaldinho, Deco, Samuel Eto'o and Pique.
The Spain international has now revealed that he had his suspicions something was going on and the news only confirmed it.
He told Terra: "I do not want to talk much about the subject, it is water under the bridge. Now there are other people in the club and we have all moved on."
Guardiola embarked on a 12-month sabbatical from soccer last summer but will resume his coaching career with Bayern Munich next season.