Dries Mertens will miss Napoli's game against Midtjylland after the Belgian attacker suffered a thigh injury.
Zenit Zenit suffered a minor setback in their Russian Premier League title tilt as they were held to a 1-1 draw by Torpedo Moscow, although the match was overshadowed by alleged racist abuse.
Zenit claimed the Russian Premier League title after they drew 1-1 with Ufa and Krasnodar were held 2-2 by strugglers Torpedo Moscow.
Friday saw the draw for the last 16 of the Europa League, with Arsenal, Atletico Madrid and Borussia Dortmund among those involved.
Iker Casillas Fernández Porto strengthened their position at the summit of Group D with victory over Lokomotiv Moscow, but Sergio Conceicao was not overjoyed.
Zenit Zenit St Petersburg laid down a marker in the Russian Premier League with a 2-0 win over champions CSKA Moscow on Friday.
CSKA Moskva CSKA Moscow beat Lokomotiv Moscow 1-0 to retain their title on a pulsating final day in the Russian Premier League.
Zenit Zenit stretched their lead at the top of the Russian Premier League to seven points with a 1-0 victory over second-placed CSKA Moscow.
As Liverpool prepare to welcome Sion to Anfield, Napoli received some good news on the injury front ahead of their Europa League clash.
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