The due diligence already completed towards Postecoglou’s possible replacement provides a clear indication of the jeopardy the Australian faces.
It would be hard for any manager to change the direction of travel in these circumstances.
Of course, Postecoglou will back himself to turn it around. That’s his nature.
Speaking in his pre-match news conference on Friday, he said: “Some look at the weeds but I look at what is growing. I am really excited as I have a group of young players willing to change.
“I just don’t fit, not here, just in general. If you look at it through the prism of ‘I’m a failed manager who’s lucky to get this job’ then of course this first five weeks looks like ‘this guy’s under pressure’. There is an alternative story that you could look at it.”
Owner Marinakis wants him to succeed, having backed Postecoglou’s track record of winning silverware as one of the key factors in why he appointed him in the first place.
Indeed, prior to their previous Premier League outing against Newcastle – that resulted in a 2-0 loss – well-placed sources told BBC Sport Postecoglou still maintained the immediate backing of the Forest owner.
There was, though, recognition that the result and manner of performance at St James’ Park would have a key influence on how Marinakis viewed his manager’s future.
Likewise, there is a feeling Postecoglou has not been helped by refereeing decisions.
For instance, during the Europa League defeat by FC Midtjylland – during which supporters turned on Postecoglou – earlier this month, there was a feeling as many as 14 key decisions went against Forest.
But with that said, the internal scrutiny on Postecoglou is intense.
Victory over Chelsea could mean he takes the first step towards what appears an unlikely road to recovery at Forest.
Lose the game, and the writing is already on the wall.