The Europa League will be Chelsea’s last, unconquered chance of winning the trophy this season after they drew their Champions League group on Friday.
While those last-16 ties will take place in the Portuguese capital, with Zenit St Petersburg hosting Chelsea, Porto meeting Inter Milan and Celtic tackling Atlético Madrid, the opener has the London side facing an exciting French tie against Atletico.
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Diego Simeone’s side finished second in the Champions League group stage – five points behind Barcelona – and defeated Chelsea’s Premier League rivals Watford at Stamford Bridge in April.
Frank Lampard’s Celtic were humbled 4-1 by Atletico during the competition in 2016 but cannot qualify for this season’s last 16 with only two points in their group, twice falling behind behind in 2-0 defeats by Atletico and AEK Athens.
Napoli are, like Chelsea, the Premier League runners-up, though the Italian club have announced they will not be allowed to play in the Champions League next season.
They too were drawn to play German club Borussia Dortmund while Austria Vienna and both Spanish sides Barcelona and Real Madrid were drawn to face off in Group H.