Arsenal face their toughest test of the season on Saturday afternoon on Merseyside.
The Gunners make the daunting trip to face Jurgen Klopp's high-flying Liverpool, with the Reds unbeaten and sitting on top of the Premier League.
Anfield hasn't been a happy hunting ground for Arsenal either and they are yet to beat Liverpool since Klopp's arrival.
The big task for Emery's side will be shackling the in-form Mohamed Salah, who has six goals in his last five games in all competitions.
Salah is one behind Pierre-Emerick Aubameyang in the top scorer chart and the Egyptian will be licking his lips at Arsenal's lacklustre defence.
And it seems the 26-year-old's rise to superstardom came as a surprise to Emery, who now firmly believes he is in the top five players in world football.
The Arsenal boss actually rejected the chance to sign him while at Paris Saint-Germain.
Emery said in his pre-match press conference, per Daily Mail: "We spoke about the possibility to sign Salah to PSG when he was playing at Roma.
"We had some doubts - and then he signed for Liverpool and these doubts he has broken at Liverpool.
"The doubts were as to how he can take the performance into one big team. For example like PSG in Paris.
"But today I can say to you, if you are speaking about the five top players in the world, one is Salah."
To be fair to Emery, not many people saw Salah's remarkable rise coming.
The Egyptian enjoyed successful spells with Fiorentina and Roma, but his jump from good to world-class has been pretty astonishing.
With Salah, Virgil van Dijk and Alisson Becker now the spine of this Liverpool side, it's hard to see them not ending their trophy drought in 2018/19.
But just imagine how terrifying a forward line of Neymar, Salah and Kylian Mbappe would look now at PSG...