According to a report in The Daily Telegraph, the man, said to be in his 40s, was interviewed under caution by Scotland Yard in June following a complaint linked to an incident at a pub in south-west London's SW6 district, which includes Fulham and Parsons Green.
Chelsea have released a statement urging fans travelling to Stamford Bridge for their English Premier League match against Arsenal on Sunday to take extra precautions in the aftermath of Friday's terrorism incident in London, as Parsons Green is near the club's stadium.
The incident took place at the Parsons Green station, which has been closed.
British Prime Minister Theresa May said military personnel would replace armed police "on guard duties at certain protected sites which are not accessible to the public".
The total number of arrests in the case has increased to six.
Earlier, an 18-year-old man was arrested in the port area of Dover. None of the suspects have been named.
The about-face comes less than 24 hours after the IPC on Wednesday announced it would allow Russian and Belarusian athletes to compete
Friday's explosion on the London tube is the latest in a string of terror attacks in the United Kingdom in recent years. Here is a timeline of the terror that has unfolded in the UK.
Scotland Yard's Counter-Terrorism Command investigating the attack arrested the 25-year-old from Newport.
"I never think it's helpful for anybody to speculate on what is an ongoing investigation," May said.
The royal couple, who are on a five-day tour of Pakistan, took a ride in a decorated rickshaw fitted with lights to arrive at the venue of the dinner.
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'A very vast majority of us will catch it at some point, about 8 out of 10 won't feel much worse than a common cold's nuisance, if at all, but some will die.' 'A very, very vast majority, at least about 98 per cent of those infected, if not more, under any circumstances, will live through it,' observes Shekhar Gupta.
Will Priyanka start a family? Or does she have some career aces up her sleeve? Longtime Rediff.com contributor Aseem Chhabra, author of
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