An x-rated banner has appeared outside Parkhead calling for Neil Lennon and Shane Duffy to be given the boot.
Celtic are on a run of just one win in six games after Thursday's defeat to Sparta Prague and the manager has come under scrutiny.
Summer signing Duffy has also been criticised after a difficult start to his career in Scotland and it seems at least one fan has had enough.
On Saturday night a banner was hung outside Celtic Park with an x-rated message to the club's board.
The home-made message reads: "Get Duffy and Lennon to f***.
"F*****g shambles."
The manager didn't spare his players after the 4-1 loss to Sparta on Thursday.
Lennon said: "I can’t defend the players. I’ve tried to over the piece. But I can’t.
"There’s a lack of application. I don’t know where it’s come from because we had a good week. A lack of hunger really apparent. The hungrier team won and that’s on us.
“It’s unacceptable. There has to be a culture change.
"I have to change it quickly and the players have to change quickly because it’s not acceptable."
