Mora said he jammed his foot into the first base bag during Saturday's loss to the Giants, resulting in an injury to a ligament. D-backs manager Kirk Gibson indicated earlier that the injury had occurred on Sunday.
Although the area around Mora's left ankle was still swollen, he said it felt better on Wednesday. X-rays taken on Tuesday were negative.
"I never play 100 percent," Mora said. "Nobody in this game plays 100 percent. I'll be fine tomorrow, maybe the next day. It's not DL stuff."
Ryan Roberts, who hit two home runs in Tuesday night's win, started at third base in place of Mora for the second straight game. Mora is batting .281 in 11 games.
"We'll let Melvin feel a little bit better before we get him back in the lineup," Gibson said. "We'll see what happens with him and plan accordingly."