Santana worked in the bullpen Tuesday before the Mets' game with the Washington Nationals and said he felt strong. He's scheduled to face the Yankees on Friday.
The left-hander, who threw the first no-hitter in team history against St. Louis, is less than two years removed from shoulder surgery.
"Everything was fine," Santana said. "I threw my bullpen. Nothing's different. I feel good. I'll be ready for Friday."
Collins said he spoke with Santana on Monday.
"He said: 'I am fine. I'll pitch whenever you want me to pitch,' I thought the extra day would help," Collins said.
Santana was happy with how he came out of the 134-pitch effort, but appreciated Collins' concern.
"That extra day is always good," Santana said.
"I know my body very well, so I know if something is not right, I'll let him know. I'm not going to do anything crazy."
New York mayor Michael Bloomberg called Santana on Tuesday afternoon to congratulate him.
Santana also said he hadn't decided what items from the no-hitter to give the Baseball Hall of Fame.