Joshua,30, faces Ruiz for the WBA, WBO and IBF titles he lost to the Mexican-American on June 1 in New York.
The British heavyweight star staged a public workout in Riyadh on Tuesday night as he plots to overturn the first defeat of his professional career.
But he has left the door open for a trilogy fight between the pair if he does get revenge on Saturday night.
The Watford warrior said: “He is going to be on my mind forever.
“If he’s dedicated to the game we will definitely see each other a third time down the line.
“This won’t be the last time I see Andy Ruiz in the ring.
“I think we make for good fights. There’s definitely knock out in this fight, that’s what the people want to see – bloodshed and knockouts.
“I feel it in my heart, I’m confident and I believe in myself that I will be victorious. You’re going to see fireworks. “
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