Hal Steinbrenner says that at times the Yankees have been "disappointed" in Alex Rodriguez.
Steinbrenner's comments come a day after Brian Cashman said Rodriguez "probably ... couldn't live up to" his $275 million contract.
Rodriguez opted out of his original 10-year, $252 million contract following his 2007 MVP season.
"That may be true. It's a big contract," Steinbrenner said. "That's a philosophical argument, I guess. It's a big contract. We all hope he's going to act like a Yankee and do the best he can to live up to it. How about that?"
A-Rod, is out until at least the All-Star break after undergoing a second hip surgery in January and is currently under investigation by Major League Baseball for his alleged involvement with the Biogenesis "anti-aging clinic" in Miami.