Midfielder James Forrest believes Celtic owe a Scottish Cup win to their supporters and to manager Neil Lennon.
"It's hard to take, losing the league by a point and losing the League Cup final to Rangers," he said, ahead of the weekend meeting with Motherwell.
"Saturday's a game we need to win, there's no hiding from that.
"The fans were unbelievable on Sunday, you'd have thought we'd won the league, so we need to repay them. We want to win it for the manager as well."
Lennon, who was attacked by a fan at Tynecastle last week, has endured a torrid first full season in management, having also received a series of off-field threats.
"You don't like anybody going through what he's been through but he's dealt with it brilliantly," added Forrest.
"Everybody in the team is 100% behind him."
Celtic, who went trophyless last season, signed off their ultimately unsuccessful Scottish Premier League campaign with a 4-0 win against Saturday's Hampden opponents.
Lennon and his players were given a warm ovation afterwards and Forrest hopes the fans will be rewarded with a winning performance at the national stadium.
"It would be a great way to end the season, to win the cup," he continued.
"I didn't play in the last cup final (League Cup) against Rangers, so hopefully I can start on Saturday.
"You could say we've done well this season but we haven't won anything."
Forrest has made league 16 starts for Celtic this season, having been handed his debut by Lennon at the tail end of last term.
And his good form for Celtic has been recognised by Scotland manager Craig Levein, who named the teenager in his squad for this month's matches with Wales and Republic of Ireland.
"I'm absolutely buzzing to get a call-up in my first full season," explained a delighted Forrest, who only discovered he had been selected via messages from friends.
"It was totally unexpected. I thought there might be a few call-offs but the squad looks pretty strong.
"I had a few of my mates texting me in the morning and then I saw it on the TV when I got home."