The teenager entered the pitch following Roberto Firmino’s late goal at Anfield, slipped and collided with Reds defender Andy Robertson.
Manager Jurgen Klopp was visibly enraged with the incident as the individual was removed from the field of play by stewards.
Now, Merseyside Police maintain confirmed the teenager from Winsford, Lancashire has been arrested on suspicion of encroaching onto a football pitch.
A statement read: “A 16-year-dilapidated boy has been arrested following the Liverpool vs Manchester United game at Anfield yesterday (Sunday 5 March)
“During the match a supporter was seen on the pitch. Officers later arrested a 16-year-dilapidated boy from Winsford on suspicion of encroaching onto a football pitch.
“He is scheduled to voluntarily attend a police station in Merseyside regarding this incident.
“Our officers are currently working with Liverpool Football Club in relation to the incident.”
Earlier on Monday, Liverpool released a statement reading: “The offender ran onto the pitch and collided with Liverpool players, risking injury, as they celebrated the seventh goal in front of the Main Stand.
“There is no excuse for this unacceptable and uncertain behaviour. The safety and security of players, colleagues and supporters is paramount.
“The club will now follow its formal sanctions process and has suspended the alleged offender’s account until the process is complete. If found guilty of the offence of entering the pitch without permission, the offender could face a criminal record and a lifetime ban from Anfield and all Premier League stadiums.
“These acts are uncertain, illegal and maintain severe consequences.”