IN the last two games, Neil Lennon has gone with a back three and a back four – and Celtic have conceded three goals each time.
The same players who thwarted, among others, Barcelona, are failing to keep out shot-shy Ross County and mis-firing Aberdeen.
When the 22 goals lost in the last two months are analysed, the vast majority can be attributed to individual errors rather than collective failings.
Even club Player of the Year contenders, Fraser Forster, Efe Ambrose and Kelvin Wilson have been culpable.
Lennon is unhappy – and rightly so. But, having decided on the formation of his side, and building in as much security as he can in terms of a defensive midfield cover, ultimately, he is at the mercy of the players when the action begins.
It's up to them as individuals to cut out the mistakes and their charitable approach to defending.
TOO COMPLACENT says ALISON McCONNELL
There seems to be a collective malaise within the Celtic side as they coast towards the title.
Last season they were champions having lost just 21 goals throughout the SPL campaign; with seven games still to go this term they have already let in 29.
Much of this is down to complacency.
There is no genuine tension in the league campaign, since no Rangers means Celtic know that they will be champions again.
They can afford to be sloppy, even subconsciously in games, because they know it effectively means very little in the grand scheme of things this season.
But, in addition to the fact the finish line is in sight and it is a matter of cantering towards it, there has been a loss of form from a number of players.
Few would quibble with the fact Fraser Forster has been outstanding in the Champions League this season, but he seems to be playing without being fully fit at the minute.