Josh Thompson has admitted Celtic's players let everyone down in their surprise 2-0 Scottish Cup defeat to Ross County.
The Bhoys were the favourites to progress to the final, but were humiliated thanks to second-half goals by Steven Craig and Martin Scott.
Teenage defender Thompson admits the loss was hard to take for Neil Lennon's squad and that their manager was not to blame.
Celtic had been two-for-two under their caretaker manager, but now Celtic will be unable to finish the season with any new silverware.
The Parkhead side take on Motherwell on Tuesday and Thompson insists the team's pride will be on the line at against Craig Brown's side.
"The defeat was horrible," Thompson said. "The fans deserved more and we let the manager down.
"Everyone knows it wasn't good enough, it's not what Celtic are about.
"I can't put my finger on it, it seemed they were winning the second balls and we didn't play as well as we can.
"The next game is on Tuesday against Motherwell and we have to go out and show pride.
"We have to redeem ourselves to the fans. That's the motivation now."