Trade deadline day is here.

The Dodgers have already accomplished their main Tarik Skubal-sized mission.

But that doesn’t mean there isn’t still work left to do –– or worries to address.

In the final hours before Monday’s 3 p.m. deadline strikes, efforts will be made to optimize the team’s present and future.

For now, however, president of baseball operations Andrew Friedman said it is “less likely” any further additions will be made to the team’s big-league roster, even after a series sweep to the Red Sox that highlighted a few remaining deficiencies.

“They outplayed us,” manager Dave Roberts said following an 8-4 loss on Sunday that handed the Dodgers their second series sweep this year. “They were hungrier … It’s not an excuse.”

While there was blame to go around over the last three days –– from base-running mistakes, to a couple poor starting/bulk pitching performances, to an offense that managed just four hits and one run after a three-run second inning Sunday –– the biggest concern lately has been with the bullpen, which is sporting a bottom-10 ERA in the majors since its record-setting 38-inning scoreless streak was snapped in late May. 

Edwin Díaz is back, but Brock Stewart and Will Klein are now on the injured list. The team’s other right-handed options are largely scuffling. And a unit that looked like such a strength earlier this season now might be the team’s biggest weakness.

Yet, according to sources with knowledge of the team’s plan, no external relief reinforcements are expected to be added.

The main reason for that, of course, is because of the Dodgers’ newfound rotation depth.

Blake Snell, Tyler Glasnow and Shohei Ohtani remain sidelined for now (though Snell is one rehab start away from returning, Glasnow is beginning a rehab stint that should have him back within a month, and Ohtani is finally scheduled to begin a throwing program again when the Dodgers arrive in Chicago for a road trip this week).

But once the group is healthy, as many as three surplus arms could be shifted to the bullpen.

The most promising candidates for that are All-Star left-hander Justin Wrobleksi and resurgent right-handed phenom Roki Sasaki. Both of them excelled in relief roles last October. Both have only improved in the 10 months since.

On the other hand, though, is Emmet Sheehan, who was kept out of the trade package for Skubal on Saturday, only to turn in a clunker in Sunday’s series finale.

After seemingly finding something with his mechanics a month ago, the third-year right-hander’s struggles have quickly returned in recent weeks, culminating in a 2 ⅔-inning, five-run clunker on Sunday that raised his ERA to 5.29.

In the loss, Sheehan’s fastball averaged a season-low 93.3 mph (a drop of more than two full ticks from just four starts ago) and he hung multiple sliders that contributed to a three-homer implosion in the third.

“It seems like it’s the same stuff,” Sheehan said of his season-long inconsistency. “It’s frustrating when you feel like you’re doing everything to fix it, and it’s not happening.”

Roberts didn’t even guarantee that Sheehan will make his next turn in the rotation, saying “I don’t know where we go from here” when asked about his status.

Like with Wrobleski and Sasaki, Sheehan is likely to replicate last year’s late-season shift to the bullpen at some point.

But before the Dodgers can count on that, there remains a drastic need for improvement in form.

If the Dodgers indeed bypass the deadline’s relief market, it could become an important subplot down the stretch run of the year.

“Everyone knows what we think of him. I mean the talent is there,” Roberts said. “But you got to perform.”

As for the trades the Dodgers still could make, there are two general categories.

The team continues to explore the sell-off of excess pieces such as Eric Lauer (who, for the time being, is shifting to a bullpen role upon Skubal’s arrival) and Alex Call (who has cracked the starting lineup just four times since June 24).

They also have a logjam of outfielders in their farm system that could prompt some minor-league deals; perhaps one that could open a pathway for top prospects Josue De Paula or Mike Sirota to receive deserved promotions from double-A.

One last situation to monitor is catcher, especially after Dalton Rushing was a late scratch on Sunday with what the team said was “minor arm irritation.”

The Dodgers have already been monitoring that market, at least for a depth option, thanks to Will Smith’s ongoing absence with a neck injury (Smith has begun ramping up activities, but is likely still at least a month away from returning).

Rushing’s status could add a new dynamic, after he felt something (Roberts believed in his elbow) during catch play shortly before first pitch in the series finale. Rushing did have an X-ray during the game that Roberts said came back negative.

“He wanted to keep trying to push through it, but for me, it’s just I didn’t want to take a chance and kind of push him anymore,” Roberts said. “So that’s why I decided to scratch him. He got treated today. And my expectation is he’s going to be with us on the plane, and then kind of day to day.”