"A.K. gives me a lefty side of that," said Mattingly, who uses Jerry Hairston and Luiz Cruz over Uribe when he wants a right-handed-hitting third baseman.
"It's hard to get [Uribe] in the lineup right now. I don't want anybody just sitting here. But at this point, with the everyday players we have and the guys he's competing with, the numbers don't line up.
"I don't know how to say it. I tried to get him going all year long. I came in thinking he'd be the guy [at third base]. He was better early. His defense has been good all year, but he's struggled for offense and I didn't know where else to go. We're down to our last 49 games, and we've got to win games. If he matches up [with the opposing pitcher], he'll play at third still."
Otherwise, Mattingly said, Uribe will be a pinch-hitter and a defensive replacement.