Britain's biggest police force has received information regarding historical sexual abuse at London football clubs.
The Metropolitan Police announcement came as the national inquiry into child sexual abuse opened the door to examining allegations within the sport.
A spokesman said it "has received information relating to non-recent sexual abuse in football clubs in London."
The Met said it will "assess any information it receives and ensure that victims are given the advice and support they need." Scotland Yard did not name any of the clubs involved.
It means there are now four police forces which are known to be investigating the growing abuse scandal in the sport.
A spokesman for the Independent Inquiry into Child Sexual Abuse said: "The bravery of victims and survivors like Andy Woodward and those other former footballers who have spoken out about the horror of child sexual abuse is remarkable, as is that of every victim and survivor who takes that courageous step.
"It is the job of the police and the court system to determine evidence of criminal wrongdoing.
"Our role is to look at institutional failure to protect children from child sexual abuse and our terms of reference are broad enough to include failures by sports clubs in due course.
"It wouldn't be appropriate for us to say more at this time, on what might be a live police investigation. We will, however, be watching events closely."
A string of former footballers have come forward since Andy Woodward became the first to speak out publicly last week about abuse he suffered at the hands of convicted child abuser Barry Bennell, a former Crewe coach.
The Premier League said it is "very concerned" by allegations and offered its sympathy and support to those who have come forward.
In a statement it said: "There is no complacency - the League's own safeguarding team visits each club regularly throughout every season to guide and quality assure their work with children and young people, ensuring their safeguarding provision meets our requirements.
"We will continue to work with clubs, the FA, statutory authorities and the NSPCC to ensure that clubs continue to be safe places for the young people who engage with them."
Asked about the recent revelations on Friday, Arsenal manager Arsene Wenger said: "First of all I was surprised and amazed that that happens in our game.
"Secondly I think we try absolutely everything inside our club to keep that out of football. For the rest, you have just to trust the inquiry to do its job and punish people who didn't behave well."