SANTA CLARA — Keion White, sporting No. 56 on his new 49ers jersey, gave a quick hello to coach Kyle Shanahan and began a light jog.

Also fresh to the 49ers’ training grounds was fellow defensive end Clelin Ferrell, in a No. 96 jersey.

After registering no sacks last game and with no productive pass rushers in their midst, the 49ers held a casting call that’s yielded both a trade for White off the New England Patriots’ bench and a reunion with Ferrell from their 2023 squad.

“We need D-linemen with all our guys injured,” Shanahan said before Wednesday’s practice.

White and Farrell will help, but don’t go summoning memories of Fred Dean’s 1981 arrival that ignited the 49ers’ first Super Bowl run. Giants rookie quarterback Jaxon Dart is still not in imminent danger when the 49ers (5-3) visit New York (2-6) on Sunday (10 a.m. kickoff).

But Farrell, a 17-game starter on the 49ers’ 2023 team, insists that a winning culture remains here. He felt that immediately upon Tuesday’s tryout.

“When I first got here, it felt like home,” Farrell said Wednesday. “There’s a lot of new people in the house, but the cooking is still the same.”White’s trade was finalized before Wednesday’s practice but he is not expected to debut on those fields until today, conjuring up memories of 2022 when Christian McCaffrey was rushed into action a couple days after his trade.

“He can play D-end and rush inside, so he’s a versatile guy,” Shanahan said of White.

A 2023 second-round pick by the Patriots, White opened last season with four sacks in the first two games, but added just one more the rest of the season. This season, he didn’t fit in new coach Mike Vrabel’s defensive picture, and after no sacks through 123 snaps, he was a healthy scratch last Sunday.

The 49ers sent a sixth-round pick in return, and they’ll also acquire a seventh-rounder unless White appears in seven games, NFL Network reported.

Ferrell was a 17-game starter in 2023 for the 49ers, before that so-called meaningless 17th game resulted in a knee injury, shelving him from their postseason run to the Super Bowl. “It’s a learning experience,” Ferrrell said. “It’s not what happens to you, it’s how you respond.”

Ferrell spent last season in Washington, which cut him in late August, and the only game he’s played this season was a 17-snap cameo in the Los Angeles Chargers’ Week 5 home loss to Washington.

The 49ers have pressured quarterbacks the least of any defense, and attrition hasn’t helped matters, though neither has defensive coordinator Robert Saleh’s blitzes. After losing superstar frontman Nick Bosa to a Week 3 knee injury, three other starting-caliber defensive ends got hurt: Bryce Huff (hamstring), Yetur Gross-Matos (hamstring, knee) and Sam Okuayinonu (ankle).

Not surprisingly, the 49ers had no sacks and just two quarterback hits in Sunday’s 26-15 loss at Houston. They also had no sacks in their Sept. 28 loss to Jacksonville and just one sack in an Oct. 12 loss at Tampa Bay.

Back in March, every starting defensive lineman but Bosa was cast into free agency. Rather than pay up for veteran replacements, the 49ers ignored the position. Then came the NFL Draft. Four of their first five picks were spent on defensive linemen, including first-rounder Mykel Williams, which signaled an all-out youth movement. Those rookies have flashed and mostly stayed healthy, but Shanahan wants Williams to get more rest in a stronger rotation.

Williams, Robert Beal Jr. and William Bradley-King are all that was left in the defensive end cupboard until this week’s additions.

To make room for Ferrell on the practice squad, rookie guard Drew Moss was waived. Farrell can be elevated three times from the practice squad before the 49ers would have to move him to the active roster.