"It's not like I'm going to say I'm going to play 50 percent," Prado said. "I have to go 100 percent or I can't play. We'll see tomorrow. I'll try to do everything I can to get back in the game."
Prado suffered the injury in the seventh inning of Tuesday's 9-4 loss to the Red Sox, when Prado reached on an error by Will Middlebrooks. He made an aggressive turn at first base thinking he could stretch out a double when he "stopped in the middle of first and second and felt something I never felt before."
Prado did stay in the game, however, until the ninth inning, when he was lifted for a pinch-hitter.
"I thought about [staying in the game], but I didn't want to take any risks," Prado said. "I know that I'll probably miss just one or two days and not the rest of the season, so I was trying to be smart about it."
Prado's versatility has been a huge addition to the Yankees since they acquired him on July 31.
He has played four different positions -- left and right field, second and third base -- and been one of the Yankees' few productive hitters lately, so the Yanks can't afford for him to miss any extended period of time as they cling to their playoff hopes. Prado is hitting .381 with 12 runs, six doubles, four home runs and 11 RBIs in his last 16 games.
"He's been swinging really well," said manager Joe Girardi. "It's not what you want. Hopefully it's just a day or two here and we can get him back, but we'll just have to wait and see."
Jamal Collier is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.