Liam Scales says Celtic got the wake-up call they needed against St Johnstone a few weeks ago.
It comes after Brendan Rodgers' men demolished the Perth outfit in the semi-finals of the Scottish Cup on Sunday.
Goals from Callum McGregor, Daizen Maeda, Adam Idah and Jota sent Celtic into next month's showpiece final.
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Scales is excited at the prospect of completing a domestic clean sweep: "We know we still need to win another game in the league," he said.
"Obviously, we want to go on and win the cup final. So, I think it's important we get a good rhythm going into the cup final, and hopefully there we can win the treble. It would be amazing."
It was only a fortnight ago before Sunday's last-four showdown that St Johnstone beat Celtic at McDiarmid Park.
Daniels Balodis' fourth-minute header proved crucial as Simo Valakari's men secured a shock victory.
Celtic have since responded by scoring 10 goals in two matches and moving within two games of a treble. Scales admits the defeat in Perth was perhaps needed.
He said: "We bounced back well last week against Kilmarnock, and that gave us the confidence to come into today [Sunday] and start well. I think we controlled the game from the start. The plan was to play in their half, and we did that.
"We tried to move the ball forward fast, and I think the first half was really, really good. It was nice to bounce back.
"It probably was true that we needed a bit of a wake-up call, and I think we've had it."
Celtic travel to face Dundee United at Tannadice this weekend, knowing that at least a point would seal a fourth consecutive Scottish Premiership title.
