Hyun-Jin Ryu (shoulder) might not pitch for the Dodgers until October.

CHICAGO >> Hyun-Jin Ryu’s left shoulder was hurting Friday morning.

The good news: The pain is from the cortisone shot Ryu received Monday — not from the inflammation that knocked him out of his last start seven days ago in San Francisco.

The bad news: Ryu hasn’t touched a baseball in seven days. He won’t throw Friday and he might not start over the final nine games of the regular season.

“Overall I feel a lot better than at first,” Ryu said through his interpreter Friday. “I’ve been working out, obviously without throwing and hurting my shoulder further. It’s a good direction. I can’t really say when (I’ll be back).”

Ryu arrived in Chicago late Thursday after his original flight was delayed. The pitcher called it “a forgettable day.” Friday would have been more memorable if he’d begun throwing. That wasn’t possible.

“The plan was to start my throwing program as soon as I feel good enough after my shot,” Ryu said, “and that’s not today.”

So, Ryu won’t start Monday. His next turn in the rotation is scheduled for a week from Saturday, a home game against the Colorado Rockies. Dodgers manager Don Mattingly wouldn’t rule out shuffling the rotation to get Ryu into a different game before the regular season is over.

But, right now, the safe bet is that Ryu won’t pitch again until the postseason, assuming the Dodgers reach the National League Division Series.

Mattingly is OK with that.

“I think he’s earned it,” he said. “The fact that the way he works — he doesn’t throw the ‘pens in between (starts) — and just his routine is different than most guys’. When he says he’s good to go, he’s good to go. It’s easy to trust him because we’ve seen him be able to do it.

“He’s different in those aspects of the way that he works. It’s different than every other guy.”

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About J.P. Hoornstra

J.P. Hoornstra covers the Dodgers, Angels and Major League Baseball for the Orange County Register, Los Angeles Daily News, Long Beach Press-Telegram, Torrance Daily Breeze, San Gabriel Valley Tribune, Pasadena Star-News, San Bernardino Sun, Inland Valley Daily Bulletin, Whittier Daily News and Redlands Daily Facts. Before taking the beat in 2012, J.P. covered the NHL for four years. UCLA gave him a degree once upon a time; when he graduated on schedule, he missed getting Arnold Schwarzenegger's autograph on his diploma by five months.