Brendan Rodgers made a rare attack on his players after the 1-1 draw at Motherwell.
The hoops went into the match on the back of vital wins over Rosenborg and Aberdeen achieved with the same outfield players.
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Last night there were six changes to that set up with Craig Gordon taking over in goals.
Motherwell had lost 2-0 at Livingston on Saturday but came into the game strongly in the second half to snatch a late equaliser through Danny Johnston to deny Celtic full points.
The incompetence of laughing referee Kevin Clancy was a major factor in the result but Rodgers was entitled to expect more from the players he trusted to deliver full points.
“I can’t rely on 11 players,” the Celtic boss told the BBC. “We’ve got a good squad who are well paid. Of course you don’t expect to be as fluent but I would still expect us to be a lot better.
“The other boys have been going to the well for us, both in club and international football, for a period of time so you have to, and you need to, have players that can come in.”
Dedryck Boyata and Mikael Lustig picked up injuries in the Hampden win over Aberdeen but the Swede should be back for Saturday’s clash with Kilmarnock.
The Ayrshire side go into that match a point ahead of the hoops thanks to a 2-0 win last night at home to Livingston.
Rodgers will have most of his big hitters back for the top of the table clash which comes five days before the Europa League clash at home to RB Salzburg.