Brendan Rodgers has been warned crocked Celtic skipper Scott Brown there is no guarantee of a top return unless he's at the peak of his powers.
The Hoops midfield has been on fire in the 33-year-old's absence, winning four straight matches.
And with Callum McGregor and Ryan Christie all the plaudits for their
midweek masterclass against Bundesliga title chasers RB Leipzig, the gaffer insists the standards have been set for anyone wanting a first team place.
Hibs three weeks ago. Injured.
However it'll be under scrutiny as much as his fitness.
Rodgers said, "We want all the boys back, Ryan Sinclair looks back to his level brilliant.
'But I do not forget what guys have given me for two and a half years. Scott Brown is an amazing player, so he wants to be great when he gets back. Olivier Ntcham is a top operator too.
'But what this shows is that the squad now, you can not come off your game.
"And now what we've got is a bunch of players playing at a really high level.
We just need them all.
"They're setting the standard now, though, which is good."
Rodgers singles out McGregor and Christie for a Celtic Scots excel on the German side.
He said: "I think you can watch the Scottish players playing at the highest level. It's about jumping and smashing into tackles, it's about blocking and intercepting.
"Blocking the lines of pass. Our rules are simple – if you give it a good time to play, but let's see how good he is.
"Guys like Callum, Ryan and Tom Rogic, you would not say they are dirty.
"That's what you have to do collectively. How they pressed the game they had no time and then had the quality to play.
Ryan has gone to.
'He needed a moment and for that moment came in the Hearts semi-final where he grew into becoming a Celtic player.
"He played with that personality, went into the game and affected it, he was efficient in the game.
"He has been a good player but lots of good players have been working out at big clubs and it has not worked out.
"He stuck with it, showed resilience, went out and got experience and his ability to take on board is great.
"For him to be playing as a No.8, to attack midfield player and play at that level shows his quality."
Rodgers insists the win over Lepizig was vindication for his refusal to compromise this season, and his faith would return after a sticky start.
He said, "What you can not have is doubt.
"I'm very much at attacking coach and that is without compromise, but people forget that you have to attack.
"Our identity is to be really aggressive and press and then we were searching for that. We were watching games, but they were not watching the same team you were watching.
"But you can not get frustrated with the players.
"You just have to keep working, analyzing, looking at performance, and then you know and trust you'll get back to the level.
"It was a collectively good performance on Thursday night and equally pleasing how we did it against a crack team."
Livingston away at lunchtime – but Rodgers insists their own standards will not falter.
He vowed, "Whether we've had good bad or indifferent results in Europe, domestically these boys have been a credit to the club. they've never switched the engine off.
"We never allow them to because the next game is the most important one.
Thanks to Leipzig, we're on astroturf pitch against a team who started the season great. It'll be a tough game – but we'll be ready for it. "