London Broncos are appealing for four supporters who removed a banner from The Hive stadium during Saturday's game to come forward before clear CCTV images are released.
The banner was taken during the Broncos' 62-10 home drubbing by Hull Kingston Rovers, which leaves them anchored to the bottom of the Super League.
It was a 22 defeat in as many games for the struggling side, who have already been relegated to the Championship.
Two second half tries from Jordan Atkins were not enough for Broncos to come anywhere near ending that miserable run and claiming a first scalp of the season.
Anyone who knows the whereabouts of the banner should email email@example.com so the club can arrange its return.
Broncos are next in action on Sunday when they travel to Castleford Tigers.