Mostert used his Instagram account to thank The Faithful for his six seasons in the Bay Area and say goodbye.
"Man I don't even know where to begin," wrote Mostert. "To the Faithful, you guys gave me hope - a purpose to become the best player I can be. We've rode the wave together through both good times and bad. From having my first ever recorded TD against the Raiders to breaking my forearm the following series. To having my record-breaking performance in the NFC Championship game to playing in the Super Bowl and scoring a TD on the biggest stage, but unfortunately coming up short.
"I came in as a kid with a dream and left as your starting running back, team captain, and with memories on and off the field I'll never forget. My family and I have loved the past 6 years in the Bay. From the bottom of my heart, I can't thank you enough."
San Francisco signed Mostert on November 28, 2016. He rushed for 1,610 yards and 11 touchdowns on 284 carries with the 49ers while adding 36 receptions for 361 yards.
More San Francisco 49ers News
-
The Most Faithful: How 49ers Fans Dominate Home and Road Games
Having home-field advantage is important in all sports. The Boston Garden, home of the Boston Celtics, was famous for its lack of air conditioning and the team's playoff record. College stadiums have nicknames that proclaim the difficulty of winning there as an opposing team.... -
49ers mailbag: What's up with Jordan Elliott's knee? Can SF stop Jonathan Taylor? What's on the 49ers' list for Santa?
The San Francisco 49ers are gearing up for the final push toward the 2025 postseason. How far they will be able to go will depend on their health and how many young players perform. Especially since some are reserves who are playing for injured players. We opened the 49ers... -
Here's How the 49ers Can Still Win the NFC's No. 1 Seed
The San Francisco 49ers are 10-4 after a dominating 37-24 win over the Tennessee Titans, but they currently sit at third place in their division, looking up at the Seattle Seahawks (11-3) and Los Angeles Rams (11-3). Despite that, the margins are close enough that the Niners,... -
49ers playoff scenarios: How San Francisco can clinch a berth in Week 16
The San Francisco 49ers (10-4) enter Week 16 as 5.5-point favorites against the Indianapolis Colts, aiming to extend their winning streak to five games as they push toward a return to the NFL postseason. With a victory on Monday night at Lucas Oil Stadium, the 49ers would...