"Yeah, we're very excited with the way he played," Lynch told reporters. "Now, Kyle coaches, he's the head coach of our team. He's also the game planner. So, while we spend a lot of time, this is our opportunity, we'll each take a couple of days off, we'll get back and really start to spend some time looking at our complete plan.
"I don't want to make any absolutes, 'Yes, he's going to be here,' all those things. But, we are pleased with the way Arik progressed and excited about his future."
The 49ers picked up Armstead's fifth-year option back in April, which means if they want to keep him in 2019 at the cost of $9.046 million in salary, they can. The option, however, isn't fully guaranteed until March. That means Lynch and Shanahan will have a decision to make before then.
"All those decisions aren't as simple as how do we feel about Arik, because if it was, then yes," Shanahan added. "Arik's done a good job, and you don't want to lose good players. Those decisions are based off of how do you want to balance and allocate all the money because you can't do whatever you want.
"What are the options out there? What's our depth chart look like? And what's the best way to do it? But, if it's as simple as just Arik, then yes, we really are happy with Arik."
Armstead had his best NFL season this year. He finished with career-highs of 48 combined tackles and three sacks through 16 games.
The 49ers made Armstead, who played college football at Oregon, the No. 17 overall draft pick in 2015. He finished the 2016 and 2017 seasons on injured reserve.
More San Francisco 49ers News
-
49ers' John Lynch explains why the pass rush has improved in 2026
The San Francisco 49ers recorded an NFL-low 20 sacks in 2025, six fewer than the next-lowest total, posted by the New York Jets. Defensive end Nick Bosa has not played since Week 2 this season, raising concerns that his absence could similarly affect the 49ers' pass rush. Bosa... -
49ers injury updates: John Lynch offers encouraging news on Nick Bosa, Kyle Juszczyk, Christian Kirk
Several injured San Francisco 49ers players have a chance to return for Monday night's game against the Washington Commanders, but they will need to make significant progress in the coming days. Defensive end Nick Bosa has been dealing with a calf injury, while fullback Kyle... -
49ers' Kyle Shanahan agrees Raheem Morris' defense has helped Brock Purdy
On Friday, San Francisco 49ers offensive coordinator Klay Kubiak said he believes quarterback Brock Purdy has benefited from facing defensive coordinator Raheem Morris' defense in practice this season. The secondary has been more aggressive, forcing Purdy to match it with... -
49ers' John Lynch discusses chances of Mike Evans, Nick Bosa facing Falcons
San Francisco 49ers wide receiver Mike Evans is dealing with Achilles tendinitis, leaving his status for Sunday's Week 7 matchup against the Atlanta Falcons uncertain. The injury forced him out of Monday night's game against the Washington Commanders in the second quarter,...