Chip Kelly wouldn’t rule out making a change from Blaine Gabbert to Colin Kaepernick after the 49ers dropped their fourth straight game Thursday night against the Arizona Cardinals.

“I think we’re going to look at everything. We’re 1-4,” Kelly said after his team’s 31-21 home defeat. “We got to make sure we’re going out there and giving us the best chance to win. So we’re going to look at everything.”

Kelly’s words were in contrast to previous weeks when he stuck by Gabbert as the starter. Gabbert completed 18 of 31 for 162 yards with one touchdown pass and two interceptions. His 56.1 passer rating was his second worst of the season behind Week 3’s loss in Seattle.

His interceptions led to 10 Cardinals points. He took seven sacks, including a safety well after the game was decided late in the fourth quarter. Gabbert’s thrown four touchdowns and six interceptions during the four-game losing streak.

“It’s extremely frustrating,” Gabbert said. “I let this team and this organization down tonight and did not play good whatsoever and that’s on me. I had two crucial turnovers there that led to points for the Cardinals and that was the difference in the game right there.

“I got to do a better job protecting the football and leading this team to scoring more points and winning games.”

Kelly said he never considered making the switch to Kaepernick during the game. He’ll begin evaluating the entire offense with coaching staff over the weekend. The 49ers travel to play the Bills on extended rest Oct. 16.

“We’ve got a couple days off here in terms of getting ready for Buffalo and then we’ll assess everything and move from there,” Kelly said. “But we’re not talking about who’s playing in a game that’s 10 days from now.”