Monaco successfully deployed a new tactic on Wednesday night that may have shown Arsenal's rivals the way to deal with their corners in the Premier League.
Arsenal have scored more goals from corners (22) than any other Premier League club since the start of the 2023-24 season, with set-piece specialist coach Nicolas Jover working his magic.
Jover was even honoured with a mural outside the Emirates on Wednesday night, but the Gunners were unable to score from a corner against Monaco, despite running out comfortable 3-0 winners.
Their inability to find the net from a corner may have been down to Monaco's approach as the French club tried something different for Arsenal's set-pieces.