LeBron James is the captain of Cleveland Cavaliers. Reuters

LeBron James is reportedly "not interest" in Tristan Thompson's personal life as long as his Cleveland Cavaliers teammate performs well on the basketball court. The 25-year-old pro basketball player is rumoured to be dating reality TV star Khloe Kardashian.

"Whatever Tristan is doing with Khloe is not of any interest to LeBron. He is focused on repeating as champs and is confident that Tristan will be ready to play and contribute to the team in about a month when the season begins," a source told HollywoodLife.

"LeBron is not going to take any nonsense and if Tristan starts focusing on being on TV and being a celebrity while dating Khloe, then that is where the problems will come. LeBron wants everyone to be ready to repeat as champs and bring another title to Cleveland," the source added.

The Keeping Up With The Kardashians star and the 25-year-old were recently kissing at Drake's concert in Los Angeles over the weekend.

The pair are believed to "have gotten much closer" over the last couple of weeks, but are "not too serious yet", a source told E News! "She hasn't had this much fun since she was with James [Harden]," the source added.

The duo ignited romance rumours earlier in the month when they were spotted getting intimate during their vacation in Mexico.

"It was clear they were a couple," an eyewitness previously told the celebrity news website. "They were PDA-ish but not overboard though, laughing together a ton and having a super good time."

The pair was also spotted at Mandala nightclub in Downtown Cabo on multiple occasions since their vacation in Mexico.

"They kissed a couple of times and held hands. They looked happy and were having a good time," another source previously said.