The intense spotlight that has fallen upon one elite Liverpool great turned to another on Anfield's most recent disappointing night.
The Egyptian forward has been under scrutiny for his struggles this campaign - and was placed on the bench for the second straight Premier League game as the Black Cats visited on Wednesday.
But it was leader Virgil van Dijk, a exceptional defensive foundation as Liverpool have swept up the complete set of major prizes, whose poor form came under the microscope during the 1-1 draw.
Van Dijk, 34, and Salah, 33, both signed high-value two-year deals in the summer, with barely a Liverpool eyebrow raised at the prospect of offering extensions to a veteran duo much approaching the end of their careers than the start.
Indeed, it was a cause of celebration - but now there is no escaping the harsh truth that performance has dipped alarmingly for both.
Liverpool have been exposed in defence ever since manager Arne Slot and the club's scouting department embarked on a £450m summer rebuild that has yet to prove anything like a good return.
Concurrently, Van Dijk has started to forfeit the sense of being untouchable he has carried since his £75m switch from Southampton in January 2018.
Van Dijk has received little support by fellow defender Ibrahima Konate's dramatic dip, along with Milos Kerkez struggling to adapt at left-back. But the esteemed defender has also fought his own battles, as demonstrated by his panic-stricken handball that gave away a penalty in the heavy Champions League loss to PSV Eindhoven at Anfield.
It was exemplified in the 67th minute on Wednesday when Chemsdine Talbi gave Sunderland a well-earned lead, Van Dijk losing possession before retreating and averting his body on a 25-yard shot that hit him and looped out of the reach of goalkeeper Alisson.
For a defender of such undoubted greatness, Van Dijk has an unusual habit of shying away on the ball, sometimes to Liverpool's disadvantage.
Ill fortune at the end, yes, but it was a situation Van Dijk courted with his atypical failure to act decisively, Sunderland's Talbi taking advantage.
"Van Dijk gives the ball away and then he just backs off. It's the wrong decision. He needs to go to the ball. Him not making the decision means that no one else knows what to do."
"Virgil Van Dijk last season was faultless. Every game he was dominant, but right now he's erring and doubting himself."
As with Salah, a player of Van Dijk's pedigree must not be discarded after winning two Premier Leagues, the Champions League, the FA Cup and two EFL Cups in a illustrious Liverpool career.
He has, though, looked a pale imitation of his usual dominant persona this season, with the worst recoveries per game during his Liverpool career, while tackles and interceptions are also down on last season.
And, while leadership should not be Van Dijk's preserve alone in a Liverpool team packed with experience, it was lacking here. No-one was motivating a team that once again looked lost to take control by the scruff of the neck.
Van Dijk's subpar showing, which ended with him being used as the emergency option of acting as an makeshift forward, was indicative of a horribly mediocre Liverpool performance - which made Sunday's win at West Ham seem like the anomaly rather than the norm.
Slot kept faith with the side that halted a run of nine losses in 12 games at London Stadium, Salah once more starting on the sidelines.
The Egyptian was introduced at the start of the second half as the Kop pinned hopes on him for inspiration. It was not forthcoming, with £125m Alexander Isak also anonymous after getting off the mark with his first league goal for Liverpool on Sunday.
Slot would have been under increased scrutiny had Florian Wirtz's 81st-minute shot not taken a deflection off Nordi Mukiele to set up what Liverpool hoped would be a thrilling finale.
Late drama came - but at the other end. Liverpool were only saved from humiliation in stoppage time when Federico Chiesa's excellent defensive sprint allowed him to turn Sunderland substitute Wilson Isidor's shot off the line after he had beaten keeper Alisson.
Slot and his underperforming defending champions ultimately had to accept the point knowing it could have been worse, with Alisson lucky to turn Trai Hume's shot onto the bar in the first half before Omar Alderete headed against the post after the interval.
Liverpool were lethargic, unimaginative and short on invention. Even the typical final push after the equaliser carried little conviction. Showings like this are the reason their defense of their crown has crumbled.
But full acknowledgment for the Reds' struggles on Wednesday must be given to Sunderland, who are being rewarded for a summer of notable ambition in the transfer market, coupled with the superb management of Regis le Bris.
The Black Cats were positive, confident and a genuine threat.
Sunderland are now sixth in the Premier League with 23 points. It is telling of the manner in which they have adapted to life in the Premier League that they will be disappointed they left Anfield without adding two more to their tally.
For Slot and Liverpool, it is back to the drawing board.
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