Yasiel Puig received an MRI exam on his left thumb Sunday and could miss tonight’s game against the San Francisco Giants.

Puig told reporters Saturday night that x-rays on the thumb were negative, but it was “pretty swollen” Sunday morning in the words of Dodgers manager Don Mattingly.

Puig sustained the injury sliding head-first into second base during the a loss to the Giants yesteday. In a best-case scenario, Mattingly said that Puig might be able to pinch-hit during the series finale tonight. He compared the injury to the left thumb contusion that Puig sustained in August of last season, an injury that forced the right fielder to miss one game.

At worst, Mattingly was hopeful that Puig could return Tuesday. The Dodgers have a day off tomorrow.

“We don’t expect it to be anything major,” Mattingly said.

Puig was dressed for warm-ups in the Dodgers clubhouse — on time — Sunday afternoon. Shortly before his teammates left for the pregame stretch, Puig changed in to street clothes and left the clubhouse without speaking to reporters.

Here’s what he told reporters last night:

Can the Dodgers get him to slide foot-first when he returns?

“That’d be good advice,” Mattingly said, “but it’s hard to stop guys from doing what they do naturally.”

Andre Ethier is starting in right field, Matt Kemp in center, and Carl Crawford in left field tonight.