The victory would also give the Gunners Champions League football next season, with a top-four finish unlikely in the Premier League, but Emery is adamant that his side have achieved nothing yet in his first season at the club.
Arsenal have revealed their team and substitutes to go up against Valencia in the second leg of their Europa League semi-final tie this evening in Spain.
In turn, Lacazette praised his teammate Aubameyang, saying after the match: "We reacted well to going behind and we knew we had to score a minimum of one goal tonight".
"We are happy but we know that it continues to be hard to win. We know it's going to be hard, and we have no chance in the Premier League, but with ambition and a strong mentality we know we can win".More news: China says trade envoys preparing to go to Washington
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During the run of his first Europa League trophy, Emery knocked out Valencia during the semi-finals of the competition thanks to a last-gasp goal from former Premier League star Stéphane Mbia.
The 47-year-old won three successive Europa League titles during his time at Sevilla and is keen for further success. It's not finished. We have one step more to play in the final.
But, with Arsenal's hopes of a return to the Champions League now all but resting on winning the Europa League this season, Cech insists he is still raring to go. 'The Europa League has improved a lot. The first time I won it with Sevilla, we didn't get Champions League access; the second time, we did.
Valencia get the win and advance to Europa League finals. Over their last 10 games Chelsea has a record of 6-3-1 which is a big reason why they secured a Champions League berth.