If the Los Angeles Lakers want to upgrade their roster, they may have to part ways with Danny Green or Kyle Kuzma.

According to Brian Windhorst of ESPN, league executives believe Green and Kuzma are the Lakers' best trade assets. Both players have big roles in Los Angeles, so it's doubtful general manager Rob Pelinka will trade either guy.

The Lakers currently don't have a roster spot to sign anyone, though, so if Pelinka is desperate to make a move, Green or Kuzma may have to be dealt:

The Lakers also have a real problem in a lack of trade assets. They aren't permitted to trade any first-round pick, and they don't have a second-round pick available until 2023. They don't have many tradable pieces, and three tradable players — Rondo, JaVale McGee and Kentavious Caldwell-Pope — have no-trade clauses. Long story short, they have to play the buyout market, and even then, they currently don't have a roster spot to sign anyone. Their two biggest trade assets, league executives believe, are Kuzma and Danny Green, but both play important roles.

The Lakers are off to a 3-1 start. Stars LeBron James and Anthony Davis are already clicking on all cylinders.

Green is averaging 12.5 points and 3.8 rebounds while shooting 47.4 percent from the field and 50.0 percent from beyond the arc through four games. Kuzma, meanwhile, hasn't played yet, as he's making his way back from a left foot stress reaction.