NBA star Jaylen Brown makes disparaging Bronny James comment during Lakers-Celtics Summer League game with rumored girlfriend Kysre Gondrezick and Angel Reese

Sitting courtside for an NBA Summer League game between the Lakers and Celtics, Boston star Jaylen Brown was caught brutally saying Bronny James 'isn't a pro'.

Next to WNBA star Angel Reese and fellow Chicago Sky player and girlfriend Kysre Gondrezick, Brown is seen leaning over to them and saying his feelings about LeBron James ' eldest son and Laker teammate.

Neither Reese or Gondrezick appear to disagree with Brown's stance, with the Celtics star shaking his head in chagrin after saying his opinion.

Bronny James was selected No 55 overall by Los Angeles in last month's NBA Draft, with a heavy influence from his father and their agent, Rich Paul , who reportedly called other teams telling them not to draft the former USC guard, or he would play overseas.

Bronny's time in the NBA's Summer League has not impressed, including a 0-for-15 mark from 3-point range since donning the yellow and purple.

Realizing he got caught by cameras, Brown walked back his stance a bit early Tuesday morning on social media.

'It’s a flex to have your son alongside you in the NBA it reflects greatness and longevity,' Brown said. 'Bronny has all the tools around him to be successful I look forward to watching his growth.'

Brown did not deny saying that Bronny is not up to NBA standards, as there has been much speculation as to where Bronny's career would stand without his father being one of the best basketball players of all-time.

Bronny signed the second-largest NBA rookie contract for a second-round pick of all-time, in a 4-year, $7.9million deal after being drafted by his dad's team.

LeBron James' son is only behind last year's No 34 overall pick, Sacramento's Colby Jones, who signed a $8.8million deal.

Brown is at Bronny's games, while LeBron is not, due to not being selected for Team USA in this month's Olympics.

LeBron is on the 12-player squad alongside Brown's Celtics teammates Jayson Tatum and Derrick White.