The left-handed-hitting slugger might serve as the designated hitter for Pawtucket on Monday and play first by Tuesday.
"I'm not going to come here to embarrass myself," Delgado told The Providence Journal. "I wasn't going to call anybody and say, 'I'm ready to work out,' if I couldn't run, if I couldn't run the bases, if I couldn't change direction."
PawSox manager Torey Louvullo was impressed by Delgado's demeanor.
"He was eager to get here and, in his words, 'get things cranked up'," Louvullo told the Journal. "He's been in a clinic rehabbing, getting ground balls from his therapist and an assortment of different drills. But he said there's nothing quite like getting on a baseball field, a professional baseball field, and getting after it."
Ian Browne is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.