Don't blame the golf swing.

Mets manager Terry Collins said Friday that golf isn't to blame for Yoenis Cespedes' ailing left shoulder and that he believes he will recover in the coming days.

Cespedes, who received a cortisone injection Thursday, was not at Friday's optional workout after doctors told him the shot would require 24 hours to take effect, a team spokesman said.

Cespedes is expected to rejoin the Mets for workouts Saturday at Citi Field, the team said.

"He's fine. He's going to be fine," Collins said. "He didn't do it playing golf. He didn't have a bad sand shot and he didn't get it stuck in the side of a bunker . . . That wasn't it. He either did it on a swing or did it on a check swing or something else, but either way, he did it."

Collins said he didn't ask Cespedes what specifically caused the shoulder soreness because "what caused the injury? Who cares! He's hurt."

Either way, Cespedes, an avid golfer who was playing at Medinah Country Club near Chicago the morning before Game 4 of the NLCS, said he didn't feel pain in his shoulder until the game against the Cubs got underway. Collins added that Cespedes "worked out like everybody does" before the clincher in Chicago.

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Cespedes batted twice before signaling to the trainer that something was wrong after striking out in the second. After the game, he could not even lift his arm, Collins said.

"He came right off and told , 'Listen, my shoulder hurts and I don't know if I can swing,' and Ray said, 'Can you lift your shoulder?' and he couldn't," Collins said. "We've got it looked at. We got it taken care of. The doctors, they said we'll be OK, so [Saturday] we'll find out."

Of course, Cespedes' health is of huge concern for the Mets. He hit .291 with 35 home runs and 105 RBIs in the regular season, including 17 homers and 44 RBIs in 57 games for the Mets after being traded by the Tigers.

Cespedes is batting .265 with two homers, six runs and seven RBIs in nine postseason games. In NLCS Game 3 against Chicago, he had a run-scoring double in the first, scored the go-ahead run on a wild pitch in the sixth after a single and stealing third, and had a run-scoring single in the seventh in the 5-2 victory.

"It was real big," Collins said of the Cespedes acquisition. "You put a big bat in the middle of your lineup. It made a huge difference."

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Cespedes -- who is making his third trip to the postseason and first to the World Series -- is aware of how important he is to the team. On Wednesday, he underlined how important it will be for him to be ready for the Fall Classic, which will begin Tuesday night.

"I'll be ready by Sunday," he told reporters. "If not, I'll chop it off and put on a new one."