Russell Westbrook has vowed to make amends after accepting the blame for the Los Angeles Lakers' surprise defeat to the Oklahoma City Thunder.

The Lakers, without LeBron James for a second game running due to an ankle injury, failed to protect a 26-point first-half lead as they fell 123-115 against a previously winless Thunder team.

Westbrook got his first triple-double for the Lakers in Wednesday's contest, but he also had 10 turnovers and was ejected late on for a second technical foul.

Nine-time NBA All-Star Westbrook took issue with Darius Bazley for scoring on a breakaway dunk, rather than dribble out the clock, with 1.5 seconds left in a feisty conclusion.

But while standing by his actions that led to that dismissal, the 32-year-old concedes that he could have done more to prevent his side from falling to a third defeat in five games.

"How I play the game, I'm more old-school," he said when asked about his confrontation with Bazley. "When s*** like that happens, I don't let it slide. 

"In the game of basketball, there's certain things you just don't do. Like in baseball, you don't flip the bat. 

"There's certain things you don't do in sports when the game's already over. And I didn't like it. Simple as that."

Westbrook, who ended the contest with 20 points, 14 rebounds and 13 assists, added: "I got to take care of the ball. There were too many mishaps allowed. 

"It's my fault. It's on me. But I'm going to take care of it. I know that. And keep the game simple. We need those possessions, especially in games like this."

Westbrook reached 7,000 career rebounds in the game, joining Oscar Robertson, Jason Kidd and James as the only players with at least 7,000 rebounds and 7,000 assists.

But it was not enough to prevent his side avoiding defeat as the Lakers allowed 115 points or more for the fifth game running this season – their longest ever such streak.

The Lakers may be going through a transitional phase with a number of new players on top of injuries to contend with, but Anthony Davis is not interested in excuses.

"This ain't no adjustment period at all," he said. "Not this game. That's just straight on us. 

"This isn't an adjustment game where I feel like it's, 'Oh, we're still learning each other'... Nah. Not this game."

The Lakers are ninth in the Western Conference ahead of their return to action on Friday against the Cleveland Cavaliers.