"I've got to be honest with myself," Scott said. "... I know I'm not on the fastball. I'm not repeating good swings."
There had been speculation that Scott would be ready to be activated when the club went to Kansas City on Monday to begin a three-game series with the Royals.
Scott explained the importance of being able to be "on the fastball."
"If I'm on the fastball and able to put consistent swings on the fastball, I can adjust to the breaking stuff," Scott said.
Scott estimated that he would need two to three games at a rehab assignment, though he noted that it "could be that I'm locked in on the first day," and he would be ready to join the team at that point.
"Right now, I just want to get to where I'm capable of doing a good job," Scott said.