Pernetti's conduct has been the subject of widespread scrutiny in the days since Rice was fired Wednesday after video footage released by ESPN showed him grabbing, shoving and kicking players during practice sessions and berating them with profane language, including gay slurs.
The teenager was playing as a goalkeeper when Mr Portillo showed him a yellow card for shoving a player on the opposing team who was attempting to score.
When he first saw the video of coach Mike Rice pushing, shoving and throwing balls at players in November, Pernetti said he wanted to fire him on the spot.