Photo: Tony Avelar / Associated Press Photo: Thearon W. Henderson / Getty Images

Not long after Kyle Shanahan apologized to tight end George Kittle when he fell just short of an NFL record, the 49ers’ head coach will have another chance Sunday.

So has Shanahan mentioned making it up to Kittle when the 49ers visit the Rams in their season finale?

“He hasn’t really said anything about it,” Kittle said, smiling. “I hope it’s on his mind.”

Kittle has 1,228 receiving yards and needs 100 to break Rob Gronkowski’s NFL season record for yards by a tight end, a mark set in 2011. However, Kittle could break Gronkowski’s record Sunday, but rank second in the record book: Kansas City’s Travis Kelce has 1,274 yards this season.

“It’s a target,” Kittle said. “I definitely want to get it done. It’s not a lost cause if I don’t get it done, but it would be really fun for us.”

Kittle had 210 yards, the third most by a tight in NFL history, in a win over the Broncos on Dec. 9. Kittle didn’t have a catch in the second half and finished 5 yards shy of breaking Shannon Sharpe’s record for a game, promoting the apology from Shanahan.

“We’re aware of it — we know the situation,” quarterback Nick Mullens said. “But at the same time, we’re trying to win the game. So if it happens, it happens and that’s awesome. Kittle has had one heck of a year and he deserves a ton of credit. … We’ll see how it shakes out.”

Roster move: The 49ers promoted undrafted rookie wide receiver Steven Dunbar from the practice squad, on which he has spent the entire season. The move was made three days after wideout Dante Pettis sustained a season-ending knee injury in a loss to the Bears.

Shanahan said he expects Dunbar to make his NFL debut Sunday. He had four catches for 36 yards in the preseason.

“Steven has been one of the most loyal 49ers this year,” Mullens said. “People don’t even know who he is yet, but he’s worked really hard. He’s caught all of my passes after practice every single day. We actually have maybe the best chemistry out of all of the receivers.

“He’s done a great job of just staying the course, trusting the opportunity that’s going to be given to him and he works hard every day. So I’m excited for him.”

Injury report: Wide receiver Marquise Goodwin (calf) and linebacker Mark Nzeocha did not practice. ... Tight end Garrett Celek (concussion), center Weston Richburg (knee), linebacker Malcolm Smith (Achilles) and cornerback K’Waun Williams (knee) were limited.

Eric Branch is a San Francisco Chronicle staff writer.