Since then, the 49ers have clinched a playoff berth and now prepare for a high-stakes Week 18 showdown against the Seattle Seahawks at Levi's Stadium. The winner secures the NFC West title and home-field advantage throughout the NFC playoffs.
With the regular season winding down, Shanahan reflected Thursday on that fiery moment with Jennings.
"That's just what people who are close do," Shanahan said with a laugh. "He was competitive. He was frustrated that he didn't get the ball. And I was frustrated that he was frustrated.
"We've been with each other long enough to know that it'll work out. Let's quit making a big deal about it. But we got in a little heated argument on the sidelines, got a lot better at halftime, and then, we really made up the next day. And we haven't had any arguments since."
The exchange may have ultimately helped Jennings reset and refocus, perhaps sparking one of the most productive stretches of his NFL career. The wideout has scored at least one touchdown in seven of his last eight games as the 49ers push toward the postseason.
"I actually think that was a good argument, where sometimes you gotta blow things up a little bit for things to get better," Shanahan said. "And I think that was a really good interaction that has only led to positives ever since then."
At the time of the incident, Jennings was battling through multiple injuries: high- and low-ankle sprains, a shoulder issue, and broken ribs—all after missing training camp time due to a calf issue.
"It was tough. It was a battle for him," Shanahan said. "I watched him grind through a number of practices, just trying to see if he could go. I know he had to miss a few games, just where he couldn't make it. And then, every time he would go, it would kind of happen again.
"So, I think Wednesdays and Thursdays were really rough. He'd always find a way to get out there Friday. When you miss time like that because you can't go, and to still be able to get himself [ready] for the game, where he's not making mistakes and everything, and just being patient.
"You always want those numbers, too. You want the ball, and it can't always go that way. And Jauan never got too frustrated, always kept his focus, and I think he made it through all that. And it's really come full circle here towards the end of the year."
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