The legendary pass rusher's shock return pairs three Defensive Player of the Year awards with Myles Garrett’s record-breaking dominance, creating a nightmare debut for San Francisco’s front.
Aaron Donald has already spent 10 seasons making life miserable for the San Francisco 49ers.
In 18 regular-season meetings, Donald piled up 77 tackles, 12.5 sacks and three forced fumbles.
The Niners probably thought they were done dealing with him.
Instead, Donald is back ... and this time Myles Garrett is lining up with him.
Donald officially announced Sunday that he is coming out of retirement and returning to the Los Angeles Rams for the 2026 season, putting one of the greatest defensive players in NFL history on the same front as the reigning Defensive Player of the Year.
San Francisco could get its first look at the pairing immediately.
The Niners open the season against Los Angeles on Sept. 10 in Melbourne, giving an offensive line that was already preparing for Garrett another pretty significant problem to think about.
Garrett alone was enough to change the equation when the Rams acquired him from Cleveland in June.
The reigning Defensive Player of the Year is coming off one of the best pass-rushing seasons in NFL history, recording an NFL-record 23 sacks in 2025. Los Angeles gave up Jared Verse and three draft picks — including a first-rounder — to bring him into a defensive front that was already loaded with young talent.
Then Donald decided he wanted back in.
Donald hasn't played an NFL snap since the 2023 season, so expecting the 35-year-old to immediately return as the same player who terrorized offensive lines for a decade would be unfair.
The version San Francisco remembers was difficult enough.
Donald recorded 111 sacks during his first 10 NFL seasons, won three Defensive Player of the Year awards and earned eight first-team All-Pro selections before retiring in March 2024.
The traditional numbers only tell part of the story.
Donald owns a 97.2 career PFF grade, making him the highest-graded defensive player of the PFF era. He also earned a 90.0-plus overall grade in all 10 seasons of his career, something no other player has done in 10 consecutive seasons.
His 2018 campaign sits atop PFF's list of the highest-graded seasons by a defensive lineman since its grading began in 2006.
And now he doesn't have to be the only problem San Francisco is trying to solve.
The Rams already had Garrett, Kobie Turner, Braden Fiske, Poona Ford and Byron Young along their defensive front before Donald decided to return. Garrett's arrival also played a role in getting Donald to reconsider retirement in the first place.
Sean McVay initially reached out to Donald for his opinion while Los Angeles was exploring the Garrett trade. That conversation helped open the door to a possible comeback, with Donald eventually beginning a regimented training process before making his return official Sunday.
For the Niners, it means preparing for a player who hasn't appeared in an NFL game in more than two years without knowing exactly what he'll look like when he returns.
There's also no guarantee yet that Donald will be ready to play when San Francisco and Los Angeles meet in Melbourne. The Rams have made his return for 2026 official, but haven't publicly established when he'll make his regular-season debut.
If he's ready for Week 1, the Niners won't get to watch somebody else figure it out first.
They'll have Garrett on one side of the problem ... and a familiar nightmare joining him on the other.
