49ers give birthday-boy Purdy a patchwork offensive line for home finale

SANTA CLARA – Practicing behind a patchwork line is not how Brock Purdy dreamed of spending his 25th birthday Friday, never mind that he just gifted 49ers linemen a caravan of trucks and sports-utility vehicles on two-year leases.

The 49ers are poised to field their most inexperienced offensive line in at least coach Kyle Shanahan’s eight seasons.

Monday night’s chore for whoever blocks: protect Purdy and clear lanes for ball carriers Isaac Guerendo and Deebo Samuel against the NFC-leading Detroit Lions at Levi’s Stadium.

Injuries have so thoroughly depleted the Niners (6-9) that 3-of-5 spots could feature linemen making their 49ers’ starting debuts. The only healthy starters are center Jake Brendel and right guard Dominick Puni, who might have to shift to other spots to provide for the best five-man look.

Left tackle Trent Williams and his backup, Jaylon More, both went this week on injured reserve, which is where left guard Aaron Banks is expected to land before Monday night’s 5:15 p.m. kickoff. Right tackle Colton McKivitz did not practice Thursday, after being limited by a knee issue, and versatile backup Spencer Burford has been out with a calf injury he sustained as the sub at left tackle in Sunday’s loss at Miami. Offensive linemen Ben Bartch and Jon Feliciano are on injured reserve.

Nick Zakelj is expected to make the first start of his career, most likely at left guard. “I know it’s just an amazing opportunity to have,” Zakelj said. “I can’t wait to go grasp it and go out there, fly off the ball and let it loose.”

Charlie Heck, poached Wednesday off the Arizona Cardinals’ practice squad, made 21 career starts for the Houston Texans from 2020-23, and Thursday acquisition Matt Hennessy made 22 starts as the Atlanta Falcons’ 2020-22 center. No other linemen have starting experience, including Zakelj, Austen Pleasants, Sebastian Gutierrez, Isaac Alarcon and undrafted rookie center Drake Nugent.

If McKivitz is healthy, he’s an option to move to left tackle, where he made spot starts at left tackle in 2021 and ’22 in place of Williams. Burford, unbeknownst until last game, had practiced as the No. 3 left tackle most of the season.

LYNCH’S STATE OF FRANCHISE

General manager John Lynch, speaking for the first time since Sunday’s official elimination from the playoffs, is in the investigation process of examining the 49ers’ 2024 woes and potential cures.

“I can’t believe we’re here, but we are. We have to accept that. We have to learn from that,” Lynch said on KNBR 680-AM. “We can’t just chalk it up to, ‘There were a lot of injuries.’ The team we’re playing, Detroit, they had a lot of injuries but they found a way. We have to look at the root, and we have been looking at the root causes. We’ll fix it.”

One obvious issue is the 49ers’ inability to close out games, something that’s carried over from past playoff defeats to this season’s four NFC West defeats. Lynch noted that the absences of All-Pros Williams and Christian McCaffrey factors into that. “But we can’t chalk it up to just that. We have to go deeper,” Lynch said. “There are ways we could have gotten it done. When you have division opponents (down) multiple scores, you have to put people away, and that’s what we didn’t do this year. We have to own that. We have to get to the bottom of why exactly that happened, with every decision we make.”

HEALTH CENTER

Fullback Kyle Juszczyk did not practice because of illness. Juszczyk has played every game this season after taking a pay cut in the spring. He is aiming for his ninth straight Pro Bowl invitation.

Running back Isaac Guerendo participated in a second straight practice and looks on track to make his third career start; he did not play in Sunday’s loss at Miami because of hamstring and foot injuries.

Running back David Montgomery (knee) was the only player on the Lions’ active roster not to practice. Cornerback Terrion Arnold (illness) was limited after missing Thursday’s session. Full participants were guard Graham Glasgow (knee), wide receiver Kalif Raymond (foot) and linebacker Jalen Reeves-Maybin (neck).

GAMEDAY GUIDE

Levi’s Stadium parking lots are to open at 1:45 p.m. Stadium gates open 30 minutes later for club- and suite-ticket holders, with entry for all others starting at 3:15 p.m. Halftime entertainment will feature MIMS and Freedom Williams (from the C+C Music Factory). Tony Lindsay will perform the national anthem.