It is a tough draw for the Gunners, with Carlo Ancelotti's Napoli currently second in Serie A -- they were eliminated from the Champions League in the group stage despite beating Liverpool at home and drawing twice with Paris Saint-Germain.
Before winning the Europa League three years running with Sevilla between 2014 and 2016, Emery really came to prominence during three years in charge of Valencia. He led them to three consecutive third-place finishes in La Liga between 2010 and 2012.
Emery and Ancelotti are both former Paris Saint-Germain coaches, but the latter may have wished for a match-up with another of his old sides, Chelsea.
Chelsea, winners of the Europa League in 2013, will fancy their chances of advancing, although they would be wise to beware a Slavia side who are top of the Czech league and knocked out Sevilla in the last 16.
The winners of that tie will go through to a semi-final against either Benfica or dark horses Eintracht Frankfurt.
Eintracht are a dangerous prospect, and the only German survivor in any European competition this season.
This year's Europa League final will be held in Baku, Azerbaijan, on May 29. The winners will secure passage to next season's Champions League group stage.
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