Robertson said that he would anticipate making at least two Minor League rehabilitation appearances to hone his command coming back from a left oblique strain.
"I'm trying to make sure it's ready," said Robertson, who said he threw hard in a bullpen session on Thursday at Yankee Stadium. "The last thing I want to do is come back and say I'm fine and then have something else happen."
Yankees manager Joe Girardi said that he does not necessarily think Robertson would need to pitch in back-to-back games before he could be activated from the disabled list.
"We'll evaluate it after each one, see how he does," Girardi said. "I thought he threw OK [Thursday]. You've got to make sure that he has his command before he comes back, but it shouldn't be too many [appearances]."