Rivera, speaking to reporters at the Yankees' annual holiday food drive, said he's "feeling good" as he continues to rehab a torn ACL.
"Oh, yeah, I don't see why not," Rivera told the New York Daily News about being ready for the opener April 1. "We have at least three months, four months until that point. I'll be ready."
Rivera, who suffered the injury in May, told the Daily News he has not started throwing regularly but recently lobbed the ball off the mound during a commercial shoot.
"My arm is good," Rivera told the Daily News. "Everything else feels good. I will start throwing a baseball pretty soon."
The 43-year-old Rivera signed a one-year, $10 million deal to return to the Yankees earlier this offseason.
"The leg's getting stronger and stronger," Rivera told the Daily News. "You have to give it time. I'm doing my part and time is doing its part."