The Turkish side must score four times on Tuesday night - or three more goals than the Gunners - to win the two-legged tie, but even then their place in the Champions League group phase depends on the verdict of the Court of Arbitration for Sport, after they were found guilty of match-fixing by UEFA.
CAS will announce its decision on Wednesday, following a two-day hearing last week.
Yanal said: "It was a difficult score and they have a squad they have been playing for a long time, but nothing is a surprise for Fenerbahce.
"A difficult game is ahead of us. The first game we lost, (but) that's not the real Fenerbahce.
"We're a great team, a great club, with great fans, some of the greatest fans in the world.
"With their energy and strength we will always show a great performance on the pitch.
"We want to do that tomorrow, go on the pitch and get a good result.
"Fenerbahce can play against any team in the world. With the result we wish to get we want to take our performance to an even greater level."
Fenerbahce will be without injured former Newcastle midfielder Emre Belozoglu, but are likely to field former Liverpool and Chelsea man Raul Meireles, and Dirk Kuyt, once of Liverpool.
Yanal expects his side to show their true ability.
He added: "We have a great squad and when they show their strength on the pitch, they will show their real performance.
"We are playing against a very powerful team. It's important we show a great performance tomorrow on the pitch."
Striker Pierre Webo is also confident of victory, although whether it will be enough to progress remains to be seen.
The former Real Mallorca striker said: "We will show everyone that what they saw during the first game is not real Fenerbahce. In my opinion, that was an accident.
"This is not reality and we will show what the reality is tomorrow."