The NBA has opened an investigation into possible tampering committed by the New York Knicks and their signing of Jalen Brunson.

Brunson left the Dallas Mavericks on a four-year, $104 million with the Knicks.

Brunson had a number of ties to the Knicks between his father, Rick Brunson, who is an assistant coach, as well as Leon Rose, who is a lifelong friend. Rose's son, Sam Rose, is Brunson's agent.

The Mavericks had a number of opportunities to sign Brunson to a four-year, $55 million extension, but declined until after the trade deadline when it became clear he would receive more lucrative offers on the open market.

Sources tell Marc Stein that the Mavericks did not file an official complaint against the Knicks.