Police have launched an investigation after 'suited men' snuck into Craven Cottage and a mobile phone was suspiciously found taped under BT Sport's desk ahead of Fulham vs. Tottenham.
The rest of the Premier League have been put on high alert after the security breach, according to the Daily Mail.
There are fears that they may be being targeted by an organised crime unit amid a potential bribery or gambling scam.
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Suspicions grew after two suit-wearing men entered the ground unchallenged.
CCTV footage was reviewed and a mobile phone was stuck to the broadcaster's gantry used by presenter Jake Humphrey and pundits Rio Ferdinand and Steve Sidwell.
The discovery was made the day before the game - which took place on Thursday, March 4 - and sparked a major security alert and a call was made to police who have launched an ongoing probe.
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No arrests have yet been made and the men are believed to have left the stadium without being questioned.
There were initial concerns of a terror-related incident.
Daily Mail reports: "Initially, there were concerns that the incident may have been terror-related.
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"While the motive remains unclear, there is now a fear that this may have been an extortion attempt with the device possibly strategically placed to record BT talent - including Rio Ferdinand, Jake Humphrey and Steve Sidwell - and a plan of bribery if any of them had been captured saying something which they would not wish to go public."
It has also been raised that the mobile phone may have been part of a gambling scam attempting to secure inside, real-time information for betting markets.
Fulham are assisting the police, per a club's spokesman.
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The Metropolitan Police said: "There have been no arrests and enquiries continue."
BT Sport, who aired the game between Fulham and Spurs, declined to comment.
Featured Image Credit: PA/BT SportTopics: Football News, Football, Premier League, tottenham, Fulham