SANTA CLARA -- For those who believe the 49ers' wide receiving corps consists of Anquan Boldin and a handful of nondescript guys, Boldin believes those opinions might change after a game or two.
"They're talented," Boldin said on Friday, two days before the 49ers' season opener against the Green Bay Packers.
"You'll see for yourself come Sunday and each game that we play. Those guys are definitely going to make plays. They're ready to make their mark on this league. I'm not worried about them at all.
"We got a lot of weapons. Even though we have some guys out with injuries, we still got a lot of guys who can make plays on the field."
Boldin has amassed 772 receptions for 10,165 yards and 58 touchdowns in his 10-year NFL career. The other wide receivers expected to be active for Sunday's game -- Kyle Williams, Quinton Patton and Marlon Moore -- have combined for 47 catches for 705 yards and six touchdowns. Michael Crabtree and Mario Manningham begin the season on the reserve-physically-unable-to-perform list, making them ineligible for at least the first six games of the regular season.
Patton, a rookie, is someone Boldin said he believes can make an immediate impact.
"He's a quick learner, and a guy who's eager to get out and make a name for himself," Boldin said. "I think you saw when he got in in the preseason, he was able to make plays. It's something we're excited about. Definitely looking forward to his growth in this offense, because we can definitely use him."
The 49ers expect to have a balanced attack with one of the most powerful offensive lines in football and with Frank Gore and Kendall Hunter rushing the ball. Tight end Vernon Davis and Boldin are expected to be the top pass-catchers, but Boldin said it would be a mistake to overlook the rest of the wideouts.
"We have some guys outside," Boldin said. "There'a a lot of guys and one ball, so we'll see how that goes."
Williams is expected to open as the 49ers' No. 2 wide receiver. Coach Jim Harbaugh said he has been impressed with what he's seen from Williams, who sustained a season-ending knee injury last November. Williams did not play in any of the four exhibition games, but Harbaugh likes what he has seen in practices.
"He's had an extremely good camp," Harbaugh said. "(He's) getting better, getting faster. I think he's come back stronger and faster than he was before. That's so important when you're coming off a big injury to come back stronger and fitter than before. Because if you come back the same, there's a chance the same thing will happen.
"You notice that he's a better, stronger version of himself."
Newly-acquired receivers Jon Baldwin and Chris Harper are likely candidates to open the season on the list of seven inactive players.