Mustapha, who made his first start of the season filling in for the injured Marques Sigle, delivered a standout performance in Seattle. He totaled seven tackles (five solo), a pass defensed, and a fumble recovery in the victory. Head coach Kyle Shanahan had praised Mustapha’s physical style after the game, describing him as “a missile out there” and highlighting how he had been ready for that moment. Mustapha also delivered a decisive hit on Seahawks wide receiver Cooper Kupp on Seattle’s final offensive possession, contributing to the Seahawks’ inability to convert on fourth down.
The NFL’s fine is a financial penalty and does not bench Mustapha. In a related development from the same game, linebacker Dre Greenlaw faced a one-game suspension for a headbutt incident on an opposing player during a second-quarter confrontation near the Seattle sideline. Greenlaw’s suspension was upheld on appeal, leaving him unavailable for the follow-up matchup.
Mustapha’s discipline comes as the 49ers navigate injuries in the secondary. Sigle’s high ankle sprain suffered in Week 4 had temporarily opened the door for Mustapha to reclaim a starting role. The young defensive back has shown why the coaching staff has remained confident in him, demonstrating aggressive play that the team wants to balance with the league’s safety standards.
The 49ers entered a Monday night game against the Washington Commanders with an undefeated 5-0 record, and Mustapha remained a key part of a defensive unit already dealing with roster challenges. As the season progresses, the team will look to maintain Mustapha’s high-impact style while avoiding further penalties.
