Pittsburgh Steelers defensive lineman Sebastian Joseph-Day (triceps) has been placed on injured reserve, the team announced on Thursday . Joseph-Day will miss at least the next four games.
Joseph-Day popped up on the injury report on Wednesday, as the veteran did not practice. Joseph-Day played 26 snaps in Sunday's overtime win over the Tampa Bay Buccaneers, a season high.
Joseph-Day has recorded 10 total tackles (three solos) and one fumble recovery through six games this season. Joseph-Day's fumble recovery off Derrick Harmon 's strip sack on Joe Burrow sealed a Steelers' win over the Cincinnati Bengals in Week 3.
The Steelers were already thin on the defensive line with Harmon on injured reserve with a knee injury. The Steelers are now down two defensive linemen. Sixth-round rookie Gabriel Rubio will now become the team's top backup DL.
Joseph-Day, who stands at 6-foot-4, 310 pounds, is in his eighth NFL season. He has spent time with the Los Angeles Rams (2019-21), Los Angeles Chargers (2022-23), San Francisco 49ers (2023) and Tennessee Titans (2024-25).
He recorded 44 tackles in 2024, with three tackles for loss, 2.5 sacks, six quarterback hits and a pass defended. Last season, he had 41 tackles, six tackles for loss, two sacks, six quarterback hits and a fumble recovery.
Pittsburgh Steelers defensive lineman Sebastian Joseph-Day takes part in an OTA practice on May 29, 2026. — Ed Thompson / Steelers Now
Joseph-Day is very versatile, playing nose tackle, three-technique defensive tackle and defensive end.
"I think, honestly, it's me not boxing myself in," Joseph-Day said about his versatility. "From the start, the beginning of my career, I played a lot of nose next to Aaron Donald, then when I left the Rams, we kinda had a need. We had one of our D-tackles that they signed get hurt, so they were like, 'Hey, can you play this three?' I was like, 'Whatever the team needs me to do.' And I did it, and I just didn't box myself in.
"Whenever I went to Tennessee, there was (T'Vondre) Sweat. Sweat is like 360 pounds, he's a big man. So obviously he couldn't play four or five, so it was a no-brainer. Jeff (Simmons) was a three, and I was like, 'I'll play the five. I'll play the six. I'll play the four.' … Just being (able) to adapt and take pride in being that guy to whatever you need me to do, I'll be that (Swiss Army) knife."
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