Guardiola refuted the allegations and also highlighted the timing of Toure's interview.
In an interview with France Football magazine, Toure criticised Guardiola's methods and views his successes in coaching as a "myth".
The storm was unlikely to clear without a response from the City manager and, speaking in Spain, he has denied there is any truth in the suggestion he is racist or treated Toure badly.
Guardiola has now responded to the comments from his former player, telling Catalan television station TV3 in quotes reported by the Spanish press: "It's a lie and he knows it". "We were together for two years, and he says it now-he never told me to my face". "He never told me face-to-face".
"You know, Guardiola can not be called a dog", he told Sport24. "But Guardiola, by his very nature, is man's worst enemy", he added.
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"He [Guardiola] insists he has no problems with black players, because he is too intelligent to be caught out, ' Toure claimed last week", Toure claimed.
"At a time when English clubs are spending huge sums of money on players, I officially declare that Yaya is ready to move to any top-six English club as a free agent with a salary of £1 per week", he said. No, I am a coach and I am good at what I do, you can't be everything. "Yaya is a victor".
The midfielder had to wait until City's final home game of the season against Brighton for his first start of the season.
Guardiola masterminded a golden era with the Catalan club between 2008 and 2012, with three La Liga titles, two UEFA Champions Leagues and two FIFA Club World Cups among a host of honours collected across four seasons.