The midfielder has been called upon to replace Francis Coquelin.
The Frenchman is very much a squad player for the Gunners this season, with Francis Coquelin the first choice defensive midfielder in the squad.
With Coquelin now out injured for the next few months with knee ligament damage, there is a chance for Flamini to step up and impress in his absence.
He did just that with a solid display in the 3-0 Champions League win over Olympiakos in midweek, but Nicholas says he still has something to learn going forward.
“The majority of the time he is calm and composed, but then he tries to steal things and get in front of people and that’s not his job,” he told Sky Sports.
"He needs to stay on his feet and make people beat him, if they’re better than him he has to accept it.”
While Flamini has so far done an admirable job off covering for Coquelin, there is no denying that he struggles to copy his game entirely.
More than anything, he does not have the same running and energy that Coquelin brings to the side, meaning he cannot play the pressing game, as Nicholas suggests.
With that being the case, perhaps it would be wise for Arsene Wenger to change his tactics to better suit Flamini’s style until Coquelin returns.
After a decent display in the Champions League, though, there will be hope that he can do a better job than first thought.