The Red Sox acquired five players in five separate trades before Tuesday’s trade deadline. Chief baseball officer Craig Breslow’s work began Friday with the addition of veteran starting pitcher James Paxton and concluded with a last-minute deal for reliever Luis Garcia right before the clock struck 6 p.m.

Breslow acquired four rentals — Paxton (from the Dodgers), Garcia (Angels), reliever Lucas Sims (Reds) and right-handed hitting catcher Danny Jansen (Blue Jays) — whose contracts expire at the end of the 2024 season.

Quinn Priester, a 23-year-old right-handed pitcher, is the only player under control beyond this season — and it’s well beyond this season.

The 2012 first round draft pick is not eligible for free agency until the 2030-31 offseason. Boston optioned him to Triple-A Worcester to work on some areas such as delivery and tweaking pitches. He also needs to be in Triple A for another 23 days this season for the Red Sox to gain an additional year of control that keeps him with the organization through 2030.

“He’s a guy that I’ve followed for a long time, actually going back to my Cubs’ days,” Breslow said. “I think he’s an extreme strike-thrower. Induces weak contact. Keeps the ball off the barrel of the bat.”

He’s in the 91st percentile in barrel percentage (4.5%), 93rd percentile in ground ball percentage (55.5%) and 73rd percentile in walk percentage (6.5%) among major leaguers this year.

That said, Priester hasn’t induced much swing-and-miss in the majors so far. He ranks in the 29th percentile in whiff percentage (22.4%) and sixth percentile in strikeout percentage (15.4%) while averaging just 6.2 strikeouts per nine innings in the majors this season.

But he has posted much better strikeout numbers at Triple A. He averaged 9.6 strikeouts per nine innings and just 1.9 walks per nine innings in his seven starts for Indianapolis, Pittsburgh’s Triple-A affiliate, this season.

“I think he’s still young and projectable,” Breslow said. “When you put his age relative to what the rest of our young major league team looks like, he’s still younger by oftentimes multiple years. If you threw him into our Triple A rotation, I think he’d be among the youngest, if not the youngest pitcher there.”

Priester — who throws a sinker, slider, four-seam fastball, curveball and changeup — is nine months younger than Richard Fitts, the top ranked pitching prospect in Worcester’s rotation. Fitts has yet to make the majors. Priester made it there at 22 years old.

“We firmly believe that if we get him in our infrastructure, his best years are ahead of him,” Breslow said. “And there’s a lot of potential to work with. He’s got a pretty deep mix and he throws strikes with five different pitches. We feel like adding some strength, working on the delivery a little bit and tweaking some of the pitches hopefully will get the best out of him.”