CHICAGO — The Dodgers ended up with an acute need at the trade deadline after all.

Catcher Dalton Rushing’s elbow injury was diagnosed as a partial tear of his ulnar collateral ligament, as manager Dave Roberts first told AM 570’s David Vassegh.

“It’s a bummer because he has made a lot of strides,” Roberts said before the Dodgers’ 7-6 loss to the Cubs on Wednesday, which extended the Dodgers’ season-high losing streak to six games. “Even just this right here, you’re talking about over 125 plate appearances that you’re missing out on, and also opportunities to catch major league innings. So I feel for Dalton.”

He’ll be shut down from throwing for four to six weeks, Roberts said. But the plan is for him to resume hitting before then. Asked if Rushing could catch again this season, Roberts said he believed there was a “very small” chance.

“I hope I’m wrong,” Roberts said. “He’s a tough kid, and so for him to go through this speaks a lot. So I think that would be great if he can. Certainly a possibility with the time, but we’re certainly trying to keep the bat alive, for sure.”

Even if Rushing doesn’t return behind the plate, his left-handed bat off the bench could be valuable for the Dodgers down the stretch and even into the postseason. As constructed, the Dodgers don’t have an equivalent for pinch-hitting situations.

Next, Rushing, in conversation with the team and medical staff, will have to decide whether he needs to undergo surgery to repair the ligament. He did not make the trip to Chicago, so he was not available to comment on the situation.

“Over the next couple weeks, I think that we’ll have a better idea of how he’s responding with time,” Roberts said. “I do think that there’s really not much cost, outside of two weeks or whatever, to kind of wait and see how he responds to some treatment and some kind of stuff that they decide to do.”

Depending on the severity of a partial UCL tear, rehab and strengthening the muscles around the elbow can sometimes at least put off surgery. If that’s not a viable option, there are a range of operations to address UCL injuries — from reinforcement with an internal brace, to full reconstruction (Tommy John surgery).

Elbow surgeries tend to come with a lengthy recovery timeline. So, even if surgery becomes inevitable, as long as Rushing can hit and the Dodgers think he can contribute off the bench into the postseason, holding off any operation until the offseason could make sense.

Rushing’s injury will impact not only the catching corps but also the offense, necessitating a shift to defense-first catchers.

Taking on starting catcher duties for nearly two months with Will Smith (neck) on the injured list, Rushing had an .809 OPS when the Dodgers scratched him from the game Sunday with what they initially called minor arm irritation.

“I think that it was something that was there, and then it just showed itself Sunday,” Roberts said.

Though Smith has been at least hitting in the batting cages, he’s had a back-and-forth recovery from an injury the Dodgers initially hoped wouldn’t need an IL stint.

“Everything keeps moving forward, which is a good thing,” Roberts said. “There’s no timeline as far as when he faces pitching, let alone when he goes out on a [minor-leauge rehab assignment]. Then we’ll have more clarity on a projected date of return, but right now I don’t know.”

So, the Dodgers acquired an entirely new catching tandem before the trade deadline Monday. On Tuesday, they activated Ben Rortvedt and Hunter Feduccia, both catchers who have played for the Dodgers in recent years. They optioned Eliezer Alfonzo and designated Chuckie Robinson for assignment.

Rortvedt, who Roberts said could get the “taking a lion’s share for the foreseeable future,” caught two-time Cy Young winner Tarik Skubal in his Dodgers debut Tuesday. Feduccia caught Lauer on Wednesday.

Lauer gave up six runs and 11 hits to the Cubs and lasted just four innings, in his worst appearance as a Dodger. Wednesday marked the Dodgers’ first loss with Lauer on the mound, snapping a streak of nine games.

The Cubs completed a three-game sweep, during which the Dodgers were outscored 22-12. They’ve been swept for two straight series, also dropping all three home games to the Red Sox last weekend. The Dodgers were last swept in consecutive series last year, getting swept by the Houston Astros and Milwaukee Brewers July 4-9.

Dodgers first baseman Freddie Freeman left the game in the bottom of the fifth inning after a pitch hit his right hand. But his X-rays came back negative, Roberts said.

“I obviously didn’t come out of that at-bat because I knew it hit my bat as well,” Freeman said. “It hit bat, then hand and pinched my hand onto the bat. Next pitch, I swung. I could swing, and I swung again. As the adrenaline wore off, pain got a little bit more.”

Freeman said he expects to be ready to return to the lineup against the Arizona Diamondbacks on Friday.