Germán was suspended by Major League Baseball on May 17 and will return to the Yankees' rotation for Monday's game in Seattle.
"You have to do something different because what I did before got me ejected from the game," he said through an interpreter. "Probably go back to previous years before where I used it way less."
Germán was disciplined after being ejected in the fourth inning of New York's 6-3 win in Toronto on May 16. He retired the first nine hitters before his hands were checked by first-base umpire D.J. Reyburn as Germán headed to the mound for the fourth inning.
After the game, crew chief James Hoye said Germán had "the stickiest hand I've ever felt."
Hoye's crew also examined Germán's hands during an April 15 start against Minnesota, when the right-hander retired his first 16 batters, but allowed him to stay in that game. Hoye had asked Germán to wash rosin off his hand and some had remained on his pinkie.
Germán said Sunday he has not gotten a direct explanation of what is the appropriate amount of rosin to use.
"As far as like a direct explanation on how much to use or not, I haven't gotten a better explanation from MLB or the umpires," he said. "To me, I have to keep using it, understand how much to use and keep a balance, but at the same time I've got to keep preparing myself to pitch and keep my routine in between starts to get me in the right shape for the next start and just keep using the rosin bag and try to keep executing pitches."
Germán was the fourth pitcher suspended since MLB began cracking down on foreign substances in June 2021 and the second this season. New York Mets pitcher Max Scherzer also served a 10-game suspension after being ejected April 19 in Los Angeles against the Dodgers.
In 2021, Seattle's Hector Santiago and Arizona's Caleb Smith served suspensions for sticky substances.
"He has to avoid that and that's us being more vigilant and check and make sure we're in a good spot," Yankees manager Aaron Boone said of Germán. "We should be fine, but I think that's the one thing about this: What is the line, there is no defined line, you can't have sticky [substances] on your hands. So he's got to be mindful of that."
German is 2-3 with a 3.75 ERA in nine starts this season. He is 28-24 with a 4.31 ERA in 101 career appearances (79 starts) since making his major league debut in 2017 with the Yankees.