Tanaka missed 10 weeks last season due to a partially torn ulnar collateral ligament in his right elbow but treated the injury with rehabilitation instead of undergoing surgery. He recovered to make two starts in September.
He earned a spot in the All-Star game and ended last season with a 2.77 ERA, 141 strikeouts and 21 walks.
Over 14 2/3 innings this spring, Tanaka has posted a 3.07 ERA with 13 strikeouts and one walk.
"I'm going to try and establish a certain pitching style this year, so it is not the wisest to ask for velocity from me this year," Tanaka said through an interpreter on Saturday.
"I think, in terms of miles per hour go, it will be lower than last year," Tanaka said.
Tanaka is scheduled to start in the Yankees' game against the Toronto Blue Jays on opening day.