49ers coach Kyle Shanahan has never dressed four running backs on a game day during the regular season. But he hasn’t ruled it out for this season.“I think we’re in a situation right now Nick Bosa 49ers Jersey , just looking at our roster, that I think it could make a lot of sense this year,” Shanahan said, via Matt Maiocco of NBC Sports Bay Area.That would mean Tevin Coleman, Jerick McKinnon, Matt Breida and Raheem Mostert all are healthy. Coleman Mitch Wishnowsky Jersey , who played for the Falcons last season, is the only one of the four to play all 16 games last season.The other three missed a combined 25 games.Even if all four are healthy, considering special teams needs, it’s not likely the 49ers keep four running backs on their 46-player game-day roster. But having four talented backs gives the team options.“Those are my brothers now,” Coleman said. “We’ll go out there and have fun together and play ball and compete together.” Nick Mullens had never set foot on the field during an NFL regular season game before Thursday. And then he started at quarterback for the 49ers on Thursday night, and he put on a show.Mullens completed 16 of 22 passes for 262 yards Mitch Wishnowsky San Francisco 49ers Jersey , with three touchdowns and no interceptions, as the 49ers dominated the Raiders 34-3. After the game, Mullens said all he needed was a chance.鈥淚 think I鈥檓 here for a reason,鈥?Mullens said, 鈥渁nd it was my opportunity to prove that I can play.鈥滱 former undrafted free agent out of Southern Mississippi, Mullens spent last year on the 49ers’ practice squad. When the 49ers traded for Jimmy Garoppolo and then gave him one of the biggest contracts in NFL history Womens Mitch Wishnowsky Jersey , it was clear that they saw Mullens as nothing more than a backup, at best. He started this year on the practice squad again, but he was called up to the active roster when Garoppolo got hurt.Then C.J. Beathard got hurt, Mullens got the opportunity to be the 49ers’ third starting quarterback of the season, and Mullens looked outstanding. All he needed was the opportunity to prove he can play.