"It got all wrist, not too much padding," Stewart said after X-rays had come back negative. "So it's not broken, just feels really weak. When it happened, I couldn't really move it around too much."
Stewart tried to shrug off the case of injury being added to the insult of a .122-hitting pitcher delivering an eighth-inning game-winning hit.
Asked if it was avoidable, Stewart said, "Well, he could've held onto the bat."
"I don't think when he let go of the bat he knew he was going to hit me, so it wasn't on purpose," Stewart added. "He's not used to hitting all that often, and not used to the results of something like that happening, so it's just unfortunate."
With Russell Martin sidelined by a sore left hamstring, Tony Sanchez caught the game's final two outs -- his first action behind the plate with the Bucs since May 21.
Stewart hoped to be good to go by Wednesday's 8:07 p.m. ET National League Wild Card Game against San Francisco.
"It doesn't feel horrible," he said. "I can move it around a little bit right now. I've got a couple of days, so hopefully it will clear up."
Tom Singer is a reporter for MLB.com and writes an MLBlog Change for a Nickel. He can also be found on Twitter @Tom_Singer. This story was not subject to the approval of Major League Baseball or its clubs.