SANTA CLARA -- Offensive coordinator Greg Roman offered up the "it's not him, it's me" routine Thursday.

Actually, it's not actually a routine, because the 49ers' primary play caller and quarterback Colin Kaepernick have never come under as much fire as they are taking now, with the league's last-ranked passing attack.

"Every quarterback in the league is going to have days where their stats weren't great," Roman said. "It's important to remember though it's not just the quarterback. It's 11 guys on the field, and it's also bringing forth a great plan, and it's something in those occasions I need to do a better job of."

Roman has been the 49ers offensive coordinator since 2011 when he came over from coach Jim Harbaugh's Stanford staff.

"Anytime we don't have success, it definitely starts with me, and we've got to get it fixed," Roman said. "It's something we're working hard to do. Anytime we fall short, I'm looking at myself first and foremost, and we've got to get it fixed."

Echoing Harbaugh's stance on Kaepernick in recent days, Roman testified the quarterback is "progressing very nicely" while continually encountering new defensive strategies.

"I think Kap understands that how the quarterback is: he's the lightning rod," Roman added. "We all have to do a better job around him to help him be successful."

For more on the 49ers, see Cam Inman's Hot Read blog at blogs.mercurynews.com/49ers. Follow him on Twitter at twitter.com/CamInman.