Celtic captain Scott Brown knows his side must forget their cup hurt and turn their attention back to the league ahead of this weekend's Old Firm derby.
The skipper admits their cup final defeat coupled with the tragic post-match events made it a difficult few days for him and his team-mates.
But he knows they have to put the shock defeat out of their system ahead of what could be a momentous trip to financially-stricken Rangers at Ibrox on Sunday.
Celtic can clinch the Scottish Premier League title with victory - provided Motherwell fail to beat Kilmarnock at Rugby Park on Saturday.
The earlier game will be a sombre occasion despite the fact Killie beat Celtic 1-0 on Sunday in the Scottish Communities League Cup final - news of midfielder Liam Kelly's father collapsing and dying in the Hampden Park stand overshadowed their triumph.
Brown told Celtic TV: "All the lads were gutted, especially when we heard the news about the kid's dad as well. It's such a shame.
"It's a sad occasion and we just wish his family and him all the best."
The Celtic players had Monday off but Brown admitted there was little prospect of relaxing following the cup loss.
"There's just so much going around in your mind - what I could have done, what I could have done better, what other players could have done and could other players have helped you out," the Scotland midfielder said.
"There are so many different situations going round in your head.
"It's hard to sleep after a game never mind a cup final. You just think about what you could have done and what you could have done to prevent the goal.
"It's a bad time now but when Sunday comes it's got to be out of our heads.
"It's a terrible defeat to take. It really hurt but we have got a league to win.
"We have a big game at Ibrox and it could possibly be the league winner."