could do nothing but watch as his Lakers side were beaten by city rivals Los Angeles Clippers in Friday night's derby.
James watched from courtside as the Clippers scored 22 consecutive points during the second half of their 118-107 victory at STAPLES Center.
The 33-year-old wore a blazer over a white hoodie and a look of frustration on his face as Lou Williams scored a season-high 36 points.
James picked up his injury during the Lakers' 127-101 victory over two-time defending NBA champions Golden State on Christmas Day when he slipped while going for a loose ball.
An MRI showed that he suffered a left groin strain rather than a tear, but no timetable has been set for his return.
Although James was understandably disappointed during Friday's match, he seemed in better spirits after the final buzzer as he watched on while his 14-year-old son showed of his basketball skills.
LeBron James Jnr, who plays for the North Coast Blue Chips at the Amateur Athletic Union level, looked very comfortable at the 21,000-capacity arena as he displayed his dribbling and shooting prowess.