LeBron James feels the Los Angeles Lakers are not "where we want to be" after they were beaten by the Boston Celtics on Monday.

James' assessment of his team's performances came in the wake of a 126-115 defeat to the Celtics on Christmas Day, a loss that dropped the Lakers to 16-15 on the season.

The defeat was the Lakers' fifth in their last six games, leaving them ninth in the Western Conference.

James knows his team must do better if they are to make it into the postseason come the end of the regular season, telling reporters: "I don't think we're healthy right now.

"I don't think we're where we want to be to compete versus the top teams until we continue to get better and better.

"For us, we're still trying to figure our situation out as far as how we want to continue to attack each game."

For the Celtics, Jayson Tatum finished with 25 points, eight rebounds and seven assists as he helped his team move up to 23-6 on the season.

Tatum believes he has learned a lot from James, paying tribute to the four-time MVP after Monday's game, saying: "He's been the most complete player in the game for a very, very long time.

"There's a lot that you can learn from a guy like him. Obviously, the way that he thinks the game, [he is] two, three steps ahead of everybody else.

"And as a younger player, just always trying to find ways to impact the game. You're not always going to make shots, but [you] still want to be the best player and dominate the game in different ways every single night. So that's what I tried to do tonight."