Sanchez, who has overseen the rise of Gennady Golovkin to a boxing super-power, took on Ruiz when the boxer was criticised for his excessive weight and quickly turned the undefeated contender into a leaner fighting machine.
As Ruiz awaits news of the venue for his clash with Parker, Sanchez explained to WBN that the decision to switch camps was a potential career-changer for the 27 year-old star.
“Everybody that trains in my gym follows our program but its hard work,” Sanchez exclusively told World Boxing News.
“The weight Andy Ruiz lost, he lost when he spent five weeks in my gym He lost a total of 34 lbs and others took the credit, but it was done in my gym and training under our system.
“All fighters have room to improve, all aspects of their craft can use tuning up, some more than others.”
On the Parker fight, which is now set to switch from New Zealand to the United States, Sanchez added: “Parker is skilled, big and a rough guy. He has a good manager/coach who knows about heavyweights and it’s an interesting matchup.
“Both guys will be new to the feelings of fighting for such an important spot but that can only be good for them in this fight,” he said.