In a surprising turn of events that has sent ripples through the NFL community, the San Francisco 49ers have made a bold roster adjustment just days before their high-stakes Monday night clash against the Indianapolis Colts. On December 17, 2025, the team announced the signing of quarterback Adrian Martinez to their practice squad—a move that, while seemingly minor on the surface, underscores the 49ers’ urgency to bolster their depth as the season intensifies.
This “bombshell” decision comes at a critical juncture for the 49ers, who are gearing up for a pivotal matchup in Indianapolis. With every practice rep counting more than ever, the addition of Martinez provides an immediate insurance policy and a familiar arm to keep the team’s preparation on track. Head coach Kyle Shanahan, known for his meticulous approach to game planning, appears to be leaving no stone unturned as the 49ers push toward the playoffs.
A Familiar Face Returns: Martinez’s Rollercoaster Season with the 49ers
Adrian Martinez is no stranger to the 49ers’ facility. The 25-year-old quarterback has been in and out of San Francisco’s orbit throughout the 2025 season, bouncing between the practice squad and the active 53-man roster. As reported by NBC Sports’ Pro Football Talk, Martinez even made a brief on-field appearance earlier this year, taking a knee to seal the 49ers’ victory over the New York Giants on November 2.
The timing of this signing is particularly intriguing. Just over a week ago, on December 9, the 49ers released Martinez from the practice squad to make room for wide receiver Javon Baker amid a flurry of roster tweaks. Now, with the Colts game looming, Martinez is back in the fold. This quick reversal highlights the fluid nature of NFL rosters late in the season, where depth and familiarity can make all the difference.
For Martinez, a Fresno native who starred at Nebraska and Kansas State in college, this return is a testament to his resilience. Over 49 college games (with 47 starts), he showcased dual-threat capabilities as both a passer and runner. His professional journey has been equally nomadic: entering the league as an undrafted free agent with the Detroit Lions, followed by stints on the New York Jets’ practice squad—including a brief one just last week—before circling back to San Francisco.
The 49ers’ decision to re-sign him speaks volumes about the trust they’ve built. Martinez knows the system inside out, understands Shanahan’s complex offense, and can seamlessly step in for scout-team duties without disrupting the week’s rhythm. In an era where quarterback injuries can derail a season, having a reliable option like Martinez is akin to an emergency parachute.
Implications for the QB Room: Stability Amid Uncertainty
This move doesn’t signal any shake-up at the top of the depth chart—Brock Purdy remains firmly entrenched as the starter, with Mac Jones serving as his primary backup on the active roster. Kurtis Rourke, currently on the reserve/non-football injury list, rounds out the group. With Martinez’s addition, the 49ers now have four quarterbacks in the building, per Pro Football Talk, creating a robust safety net.
But why now? As the schedule tightens and the margin for error narrows, the 49ers are adopting a “no surprises” philosophy. Practice-squad signings like this often serve as contingency plans: a quarterback who can absorb the game plan, mimic opposing offenses in drills, and be elevated if disaster strikes. With the Monday night game against the Colts on the horizon—a contest that could have major playoff implications—the team is prioritizing preparedness over experimentation.
Injuries have plagued quarterback rooms across the league this season, and Shanahan’s staff isn’t taking chances. Martinez’s ability to provide quality reps without a lengthy onboarding process makes him an ideal fit for this late-season push. It’s a reminder that in the NFL, depth isn’t just about talent—it’s about trust, work ethic, and the capacity to bounce back from setbacks.
Why This Move Matters Heading into Indianapolis
The Colts game represents a make-or-break moment for the 49ers, who are battling for positioning in a crowded NFC playoff race. Facing a tough Indianapolis defense on the road, San Francisco needs every edge. Martinez’s signing ensures that if Purdy or Jones encounters any last-minute issues—be it a tweak in practice or an unexpected illness—the team has a vetted option ready to go.
Beyond the immediate game, this move exemplifies the 49ers’ front-office savvy. General manager John Lynch and Shanahan have built a reputation for shrewd, under-the-radar transactions that pay dividends in crunch time. Martinez’s return isn’t flashy, but it’s strategic: a low-risk addition that reinforces the team’s depth without cap implications or long-term commitments.
For fans, it’s a sign of the organization’s commitment to contending. As one insider noted, “NFL careers rarely run in a straight line,” and Martinez’s story embodies that. Getting cut and rehired in quick succession shows the value of professionalism and system knowledge—qualities that could propel him to bigger opportunities if the stars align.
Looking Ahead: A Calculated Risk in a High-Stakes Season
As the 49ers prepare to board their flight to Indianapolis, this quarterback shuffle adds an extra layer of intrigue to an already compelling matchup. Will Martinez see the field? Probably not, unless circumstances demand it. But his presence alone could be the difference in maintaining momentum through a grueling week.
In the end, this “bombshell” is less about drama and more about diligence. The San Francisco 49ers are playing chess while others play checkers, ensuring their quarterback room is fortified for whatever the Colts—and the rest of the season—throw their way. Stay tuned for Monday night; the fireworks might just start before kickoff.