Postpublished at 19:58 Greenwich Mean Time 18 February 2021
Benfica v Arsenal (20:00 GMT)
Benfica and Arsenal's only two meetings came in the last 16 of the 1991-92 European Cup, with Benfica winning 4-2 on aggregate.
Arsenal have faced five different Portuguese opponents in European competition and beaten all but Benfica.
Benfica have won the first leg of their last nine Europa League knockout ties when it’s been at home and won 14 of their last 17 first leg matches in the knockout phase overall.