Colin Kaepernick or Blaine Gabbert? 49ers Coach Chip Kelly has a decision to make

The San Francisco 49ers have lost four in a row. They have 10 days before their next game.

Starting quarterback Blaine Gabbert had a bad game Thursday night in a 33-21 loss to the Arizona Cardinals — and it wasn’t even his worst performance of the season. Fans were chanting the name of backup QB Colin Kaepernick.

Considering all of the above conditions, is it time for first-year Coach Chip Kelly to pull the trigger on a quarterback change? Kelly didn’t commit to anything after Thursday’s game — but he didn’t rule it out either.

“We’re 1-4. We’re going to look at everything,” Kelly said. “We have to make sure we’re giving our team the best chance to go out and win.”

It’s hard to make the argument that Gabbert does that at this point. Against the Cardinals, he compiled a quarterback rating of 56.1 while completing 18 of 31 passes for 162 yards with one touchdown and two interceptions.

In a 37-18 loss to Seattle two weeks ago, Gabbert’s QB rating was 51.9 after he completed 14 of 25 passes for 119 yards with no touchdowns and one interception. For the season, he’s completed 58% of his passes with five touchdowns and six interceptions, and has a 69.6 QB rating.

Kaepernick is a former Super Bowl starter for the 49ers who has become more known for his refusal to stand during the national anthem this season than anything else. He started eight games and played in nine for San Francisco last year, and while his numbers were considered subpar — completing 59% of his passes with six touchdowns and five interceptions, with a QB rating of 78.5 — they’re at least slightly better than Gabbert’s this season.

He hasn’t had a chance to start in Kelly’s offense yet. Gabbert has — and now it might be time to try something else.

charles.schilken@latimes.com

Twitter: @chewkiii