Breida left Sunday's game against the Chicago Bears after reaggravating the ankle sprain which has plagued him for most of the season while Pettis left with an MCL sprain. Neither returned to the game.
"I think Matt's had a very impressive season," Shanahan said of Breida. "He started out great filling in (after) losing McKinnon at the beginning of the year. Matt stepped in right away and played like a No. 1 back. I think he was up there for a while close to leading the league in rushing. He's got a ton of explosives. Had good yards per carry.
"He got hurt early on, and he's battled every week to get in there and play for us, and he's ended up hurting it every week also, so it's lingered all year. Just a credit to him to still be effective when he's been out there and to be able to help us throughout the year has been unbelievable.
"He has not been 100 percent for a while, and that has affected his production. It has made it harder for him to look the same way he looked at the beginning of the year, but it shows you the type of guy he is and that he can still take it to a whole other level the healthier he gets for next year."
Shanahan also provided some other injury updates. Tight end Garrett Celek is in the concussion protocol while wide receiver Marquise Goodwin (calf contusion) and cornerback K'Waun Williams (knee) will be re-evaluated on Wednesday.
The 49ers made Pettis a second-round draft pick out of Washington in April. He has 27 receptions for 467 yards with five touchdowns through 12 games and seven starts this season. Pettis leads all wide receivers in receiving yards and all 49ers players in touchdown receptions.
The 49ers signed Breida as an undrafted free agent out of Georgia Southern in 2017. He has 814 rushing yards on 153 carries (5.3 yards per carry) with three touchdowns and has added 27 receptions for 261 yards with two receiving touchdowns through 14 games and 13 starts this season.
Related News
More San Francisco 49ers News
-
49ers injury updates: Ricky Pearsall held out of Thursday's practice
San Francisco 49ers wide receiver Ricky Pearsall will not take part in Thursday's practice—the team's first on-field session of the week—as he continues to recover from multiple injuries. Pearsall was banged up during Sunday's win over the Tennessee Titans, first suffering... -
49ers vs. Bears injury report: Kittle sidelined, Pearsall returns, other practice notes
The San Francisco 49ers are preparing for their Week 17 contest against the Chicago Bears on Sunday at Levi's Stadium in Santa Clara, California. As expected, tight end George Kittle did not practice after suffering an ankle sprain in Monday night's win over the Indianapolis... -
Kyle Shanahan shares final updates ahead of 49ers-Colts Week 16 matchup
San Francisco 49ers head coach Kyle Shanahan spoke to reporters following Saturday's practice, providing final updates ahead of the team's Week 16 matchup against the Indianapolis Colts. Here's everything he said. Transcript provided by the San Francisco 49ers Communications... -
Kyle Shanahan shares final updates ahead of 49ers-Bears Week 17 matchup
San Francisco 49ers head coach Kyle Shanahan spoke to reporters following Friday's practice, providing final updates ahead of the team's Week 17 matchup against the Chicago Bears. Here's everything he said. Transcript provided by the San Francisco 49ers Communications...