ALAMEDA — A day after the Raiders were doomed by their lack of physical play up front in a 31-13 loss to the Kansas City Chiefs, their coach was still feeling the effects.

“I think Kansas City played a lot more physical than we played,” interim coach Tony Sparano said Monday. “I didn’t love the way our fronts played yesterday, particularly on the offensive side of the football.”

Quarterback Derek Carr was sacked four times, and Sparano said pressure throughout the game contributed to his poor stat line. Carr completed just 27 of 56 passes — a 48.2 completion percentage that was his second-worst of the season — for 222 yards. He averaged fewer than four yards per attempt for the first time during his rookie year.

The Chiefs, who are tied for sixth in the NFL in sacks, lined up five or six pass rushers all day against Oakland. Sparano, the team’s offensive line coach before assuming the interim head coach role, said more of those battles must be won.

“Up front offensively, we didn’t win some of those one-on-one matchups, and that’s my responsibility,” Sparano said. “A week ago, we won those one-on-one matchups and Derek had time. We can’t let the quarterback get hit like he got hit yesterday.”

Sparano said there were “one or two things” Carr probably wishes he could’ve had back but mostly pinned those on the pressure he faced and said he was pleased by the quarterback’s decision-making. Games like Sunday’s also should prove to be opportunities for Carr to learn.

“There’s huge lessons to be learned,” Sparano said. “When you play against a front like that and the fronts we had to play against the last couple weeks and this week, pockets won’t always be clean. They just won’t. … At times when pockets aren’t clean we’ve got to be able to escape and extend and create a little bit.”

Sparano doesn’t foresee anything changing in the next two weeks from having Latavius Murray serve as the team’s lead running back. He had 12 carries for 59 yards against the Chiefs before the Raiders had to abandon the running game when they fell down 31-6 in the third quarter. Murray said he isn’t necessarily viewing this final stretch as an audition for him to remain the team’s primary back next year. “I just want to go out there and be productive, and I want to do anything I can to help the team win,” Murray said. “In that process, if it is proven that maybe I deserve the chance to remain the starter, that’s it. But that’s not really what’s been in my train of thought.”

Wide receiver Rod Streater’s practice period expired Monday, and the Raiders will place him on season-ending injured reserve. He had been on the designated to return injured reserve list since fracturing his left foot in Week 3. Streater began practicing Nov. 24, opening the three-week window the team had to activate him. That expired Monday with him not healthy enough to play the final two games.