Matt Kemp soon could be back on the disabled list.

Over the next day or two, the Dodgers' medical staff will determine whether a sprained left ankle will require that Kemp be put on the disabled list for the third time this season. Kemp's ankle was still considerably swollen Monday.

"I don't know if we really know how bad it is," Manager Don Mattingly said.

Mattingly backtracked from comments he made the previous day, when he said he was confident Kemp would avoid the DL. Kemp rolled his ankle in a home-plate collision Sunday in his first game back from his latest DL stint.

"I probably don't feel as good about it today as I did yesterday," Mattingly said. "It could go the wrong direction."

Even if the swelling in Kemp's ankle subsides quickly, Mattingly said he probably will sit out the Dodgers' three-game series in Toronto against the Blue Jays.

Kemp underwent a precautionary X-ray exam Monday. Results were negative.

Kemp has already spent 35 games on the disabled list this year. He strained his right hamstring in late May and irritated the AC joint in his left shoulder earlier this month.