When you have been dumped out of the FA Cup by a lower-league side and been outplayed from start to finish, you know you have problems.
When your manager then accuses his players of lacking desire and warns them their futures at the club are at risk, then the alarm bells really do start ringing.
Yet that was exactly the scenario which unfolded at Leicester City on Sunday after they were beaten 4-1 at Nottingham Forest in the FA Cup fourth round.
It was a stuffing – signed, sealed and delivered by Leicester’s fierce East Midlands rivals.
Rodgers was angry and embarrassed at the way his side surrendered the trophy they won last season.
The Foxes boss fumed: “Our players have to look at themselves in the mirror and prove they are good enough to be here.
“A lot of players have to improve. It was an awful performance. I have to apologise to the fans. We needed physicality and authority and lacked it.
“There was a lack of hunger and you get destabilised when you make errors. That’s the first time since I’ve been here that I was embarrassed.”
Leicester’s owners will have seen, heard and read Rodgers’ scathing assessment of his players’ display at the City Ground.
Thus it comes as little surprise that the odds on the 49-year-old being the next Premier League manager to be sacked have shortened dramatically since Sunday.
Quite what is happening behind the scenes at the King Power Stadium could become clearer in the coming days, but it would appear that Rodgers is at risk.
Rodgers remains highly rated, of course, and is fourth on the list of bookies’ favourites to be the manager of Manchester United at the start of next season.
But, given Rodgers’ current situation at Leicester, the United hierarchy are hardly likely to be beating a path to his door right now.