The La Liga giants have cruised to a 3-0 victory over Ajax Amsterdam in their UEFA Champions League Group D clash, and earlier reports indicated that the Madrid duo had a heated exchanged during a practice session before their win.
However, speaking to Marca, Casillas laughed off the rumours.
"I've been a professional for 12 years now and there are always rumours like this. I can only laugh about it. Amid jokes we have said: 'Where are the photos? because we want to see them".
The Spain custodian also revealed his thoughts about their spanking of Ajax.
"These are the types of games that we should be winning," he said. "Ajax proved themselves to be worthy opponents from the start when they looked to create chances and control the game.
"However, we were good tonight. We will now be looking to win the rest of our home games and want to do well in the back-to-back matches against Lyon we have coming up", the 30-year-old concluded.
Real Madrid have won both group fixtures in Group D, and look likely to make the knock-out stages should they continue in this vein of form.