Schalke officials made the accusation this week.
But Galliani insisted: "I am not interested in the words of another person, but only Boateng.
"I have spoken several times with him and he has never revealed this difficulty, there was no problem. He never talked about racism.
"Negotiations with Schalke 04 started and finished in 24 hours. "
For the big stories and the banter follow us on Twitter: @tribalfootball