INDIANAPOLIS — There isn’t much going right for the Indianapolis Colts’ offense at the moment.

It’s failed to generate even 300 total yards in three of the last four outings — two each under veteran Joe Flacco and 22-year-old Anthony Richardson at quarterback — and its reached the 20-point mark in just two of those contests, once under each QB.

The hope is Sunday’s 21-13 loss at the Minnesota Vikings is the nadir. The Colts (4-5) gained a season-low 227 yards, and the only touchdown came on a fumble return by cornerback Kenny Moore II.

It was a particularly painful performance given it came in front of a national prime-time TV audience, and it capped a week during which Flacco took over as the full-time starter with a mandate to make a playoff push.

But, just as was the case with Richardson under center, it’s not only about the quarterback.

Flacco posted just a 63.7 rating, going 16-of-27 for 179 yards with an interception.

But the 39-year-old was sacked three times and hit a total of seven times in the pocket.

And, for Flacco’s third consecutive start, Indianapolis was unable to get any kind of ground game going.

The Colts averaged just 3.6 yards on 19 carries overall, and star rusher Jonathan Taylor ran 13 times for just 48 yards.

Indianapolis has yet to break the 100-yard rushing barrier in three starts under Flacco, despite surpassing the mark in all six of Richardson’s starts.

It’s a factor the Colts hope to change Sunday against the Buffalo Bills (7-2).

“It’s going to take being physical,” Taylor said Thursday at the Indiana Farm Bureau Football Center. “Anytime you can be physical at the line of scrimmage, that kind of not only gets guys up front going, guys on the sideline going, gets the crowd going. So just being physical up front.”

The offensive line has taken more than its fair share of injury hits this season.

Left tackle Bernhard Raimann did not play against the Vikings because of a concussion. Center Ryan Kelly was placed on injured reserve this week with a knee injury. And right guard Will Fries is out for the season because of a broken fibula.

All three have been replaced by rookies. There is optimism Raimann will return this week, and the expectation is Kelly won’t miss a great deal more time than the four-week absence required on IR.

But Fries won’t be back in the huddle until 2025.

“Will was playing at a tremendously high level, really proud of the player he’s developed himself into,” Colts offensive line coach Tony Sparano Jr. said. “That didn’t happen by accident. He’s a tireless worker. He’s just — he’s everything you could ask for as a coach. He’s just incredible.

“So I just — I hate what happened to him with the injury, but I know he’ll be back better than ever because of how hard he works. He’s already out there and rehabbing and doing all the things he’s gotta do.”

Undrafted rookie Dalton Tucker has filled Fries’ role for the past four games, and Sparano has seen improvement each week.

The position coach was high on Tucker’s potential because he saw a natural fit with the style Indianapolis’ offensive line plays and the toughness and skillset of the player.

Much of the same is true for center Tanor Bortolini, a fourth-round draft pick who has made two previous starts in place of Kelly this season and is penciled in as the starter for at least the next month.

The third rookie starter this season is left tackle Matt Goncalves, a third-round draft pick who filled in for Raimann last week at Minnesota.

Two of the three rookies are likely to be in the lineup for the foreseeable future, and the third remains just a snap away from a return to the field.

Sparano said the expectations will not change along with the personnel.

“I told all three of them when we got them that they weren’t here for three years from now. They were here for now and into the future,” Sparano said. “We need them now. As I always tell them, it’s not college. This is the NFL, and if you’re on this roster, you’re on this roster because you can do a job for us.

“And when your number’s called and when we need you to step in, we expect the standard to remain the standard and the level to not drop.”

INJURY REPORT

Linebacker Zaire Franklin (ankle) returned to full participation Thursday, leaving wide receiver Michael Pittman Jr. (back) as the only member of the 53-man roster not practicing.

Goncalves (shoulder/finger), defensive end Dayo Odeyingbo (elbow), Raimann and right tackle Braden Smith (knee) remained full participants for a second straight day.

Wide receiver Keon Coleman (wrist) again did not practice for the Bills.

Wide receiver Amari Cooper (wrist), cornerback Kaiir Elam (shoulder), fullback Reggie Gilliam (hip), wide receiver Mack Hollins (shoulder) and wide receiver Curtis Samuel (pectoral) were limited.