The All England Club is "looking into" reports that Olympian Mo Farah may have broken Wimbledon rules by filming play from the Royal Box.
The Olympian uploaded footage which he posted on Twitter after a visit to SW19.
Farah, who sat in the Royal Box along with Sir Bruce Forsyth and actor Stephen Fry, later wrote on Twitter: "Really enjoyed been (sic) at Wimbledon today..!!"
He added clips showing action on court as well as images of himself in the Royal Box.
According to Wimbledon rules, phones "must be switched off in and around the courts in play".
A spokesman for the club said it was "looking into" the reports.