The NBA has sent a memo to all 30 teams reminding them of tampering rules.

The memo was aimed to "serve as a reminder of the league's anti-tampering rule."

In the letter, NBA says, "employment contracts are to be respected and conduct that interferes w/ contractual relationships is prohibited.

"This principle is particularly important in today's media environment, where any actions or comments relating to potential player movement receive immediate and widespread public attention. Teams should be entitled to focus their efforts on the competition this season with the players they have under contract, without having to divert attention or resources to conduct or speculation regarding the potential destinations of those players in future seasons once their contracts expire."

The memo comes approximately a week after LeBron James spoke publicly about wanting to play with Anthony Davis.