Celtic manager Neil Lennon was happy with his players - some of whom have featured in 35 games already, after they extended their unbeaten start to the Scottish Premiership season to 17 games.
Netherlands defender Virgil van Dijk netted the only goal of the game in the fifth minute with a superb finish, following a mazy run which was initiated from his own half, and the Hoops secured a 1-0 win over St Johnstone at McDiarmid Park.
It has been a long season for Celtic - who started their campaign in mid-July as they faced three qualifying rounds on their way to making the group stages of the Champions League.
Regardless of this, the Glasgow giants have now built up an ominous11-point lead at the top of the Scottish Premiership table.
And Lennon have reserved words of praise for his side as he insists they were working hard to preserve their unbeaten status in the league.
"Our performances have been fantastic. There are only a few clubs now in Europe unbeaten and we want to preserve that for as long as we can," the Celtic manager said.
"That takes a lot of physical and mental strength and they have shown that in abundance.
"Some of our players have played 35 games already. That's a season for some people and we're not even out of December yet.
"We would have dropped points this time last year. There is more of a will to win about this year.
"At times it's not pretty but you can't always play silky football the way you'd like.
"You have to earn the right to play and sometimes you have to dig out a few results. But I always felt we were in control of the game but for that 10 or 15 minutes in the second half."
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