Arsenal, beaten semi-finalists previous year, know that winning the tournament would secure a return to Champions League football, with Emery admitting last week his side are "outsiders" in the race for the Premier League top four.
The Gunners are now fifth, one point behind a resurgent Manchester United who have been in great form since the appointment of an interim manager, Ole Gunnar Solksjaer who took over from Mourinho.
And if Unai Emery can not solve this problem quickly, the Gunners will find it really hard to finish in the top-four this season. This season we have conceded goals too easily.
Despite their frailties at the back, Arsenal remain just one point behind fourth placed Manchester United heading into the final 12 Premier League games of the season.
Franck Kessie has also been attracting the interest of French Ligue 1 champions Paris Saint Germain (PSG) apart from the London duo of Arsenal and Chelsea. After 26 games we are on our way and our motivation is very great and we've brought our target closer. I've been supporting them since I was a kid and I've been watching them since I was young, so to be able to sign with such an wonderful team is really good.
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"Saturday is a very big opportunity for us", said Emery, who wants a repeat of the form Gunners showed in beating Spurs 4-2 at the Emirates in December and Chelsea 2-0 last month.
Arsenal boss Unai Emery has targeted winning this competition from the get-go, which is hardly surprising for a man that won the tournament three times with Sevilla.
Unai Emery insists his Arsenal side can make no excuses when their Europa League quest gets back under way in a freezing Belarus. "It was important for us to win and also to win away".
Arsenal reached the first knockout stage by registering five wins and a draw from six matches as well as five consecutive clean sheets, but The Gunners have struggled for consistency since the middle of December.
Emery was clearly pleased by this. "I think today I am very proud with our work".