It seems that any substitution involving Yossi Benayoun causes surprise these days. Less than a week ago the Israeli’s late withdrawal, during Liverpool’s loss to Lyon drew a chorus of boos from the club. Last Wednesday, he emerged from the bench 15 minutes from time as the Reds chased the game at Arsenal, and his introduction raised more than a few eyebrows.

It was not that it was Benayoun being brought on, of course. The 29-year-old’s guile and composure was more than welcome at a stage when Liverpool were on top of their energetic but inexperienced opponents. The consternation from the travelling pocket of Reds supporters packed into a sold-out Emirates Stadium came from seeing that it was David Ngog who was to be replaced.

Ok, it is not the same as removing, say, Fernando Torres, but still it was surprising. The young Frenchman had given Rafa Benitez 75 minutes of hard-work, and plenty of quality. It was his clever back-heel which opened up a glorious chance for Philipp Degen in the early stages, one that the Swiss full-back wasted.

Contrasting his performance with another Liverpool player looking to establish himself as an understudy (or partner) for Torres, Ryan Babel, and it is clear to see which player is showing more promise at this stage.

Babel cost more than £11 million, seven times as much as Ngog, when he arrived at Anfield from Ajax in 2007, and the early signs were highly promising. Moving with a fluidity which reminded Kopites of John Barnes or Thierry Henry, the Dutchman netted ten goals in his debut season at the club, and looked set to push on and establish himself as first choice.

That he has not is a damning indictment, at a time when quality attacking players at the club are apparently in such short supply. Torres is undoubtedly the top dog at Anfield, but there is an undoubted chance for someone like Babel to nail down a regular place. A chance, it appears, he is unable, or unwilling, to grasp.

On Wednesday night, he flitted around halfheartedly, offering only a partial threat as Liverpool were second-best for large spells. One nod down for Emiliano Insua’s goal, and a skimming 30-yard free kick that Lukasz Fabianski fielded well was the sum total of his night’s work. A night that was capped with a poor miss, as he failed to connect with Dirk Kuyt’s low cross late on.

Babel’s apologists point to the fact that he is yet to fully earn the faith of Benitez, and that he has never received a prolonged run in the first team. There may be an element of truth in this. Babel has already been named as a substitute 55 times in his short Anfield career, and has been substituted on countless other occasions. But when confronted with statistics such as those, is it not logical to wonder why?

The answer, it seems, is a case of attitude. Ngog may not be the darling of the Kop, though his strike against Manchester United last weekend will help, but his performances always display plenty of hard-work, a willingness to learn and improve, and a team-first attitude. Supporters respond to such traits, and the Frenchman is currently reaping the rewards.

For Babel, who has made plenty of noise in the past about needing to leave in order to secure first-team football, the long-term prognosis is less promising. It is clear that the talent is there, but Benitez could be forgiven for doubting if this Liverpool side are able to unlock it on a regular basis. The January transfer window may represent Liverpool’s best chance to pick up a sizable fee for Babel, who will be 23 by the time Christmas comes.

Obviously things can change. Babel’s pace and shooting power means he will always appeal as an alternative option from the bench, but at this moment in time, it makes more sense to back the Frenchman than it does to go Dutch.