Borussia Dortmund coach Juergen Klopp admitted he was relieved to be "back in the race" for a Champions League last-16 berth after its 3-1 win over Napoli.

Dortmund's 1-0 home defeat to Arsenal three weeks ago had left last season's finalist third in Group F and heading for a group stage exit.

But a Marco Reus penalty and second-half strike by Jakub Blaszczykowski put Dortmund up 2-0 with an hour gone before Lorenzo Insigne pulled one back for Napoli with 20 minutes left.