Brendan Rodgers refused to criticise one Celtic player after his side's loss to St Johnstone on Sunday.
The Parkhead side looked to take another step closer to securing their fourth consecutive Scottish Premiership title, although Daniels Balodis' fourth-minute header eventually proved the difference between the sides.
The defeat was Celtic's second in three games and took their dropped-points tally for 2025 alone to 14.
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Boss Rodgers was highly critical of his players post-match as he questioned their levels of desire and drive.
He refused to find fault with his captain, Callum McGregor, however.
He said: "There's maybe a few [players] that are comfortable. And comfort is not a physical place. When you're comfortable, you become a bit timid, and you lose duels, and you lose the fight.
"And you can never be that. And you can never be that if you want to be a top player. So collectively, that's the annoyance.
"It's easily done. You can go into the game and look for an easy game, top to bottom. But the very best players are right on it from minute one.
"And I'm not talking here about boys like Callum McGregor, who deals with expectation, who deals with being the underdog in the Champions League and guys like that. But there's absolutely no doubt, around some of our starts, we have some players going in looking for an easy game. And that's what we need to look at."
Despite their loss to St Johnstone, Celtic could still win the league this weekend, should they beat Kilmarnock on Saturday and Rangers lose to Aberdeen at Pittodrie on Sunday.