Xavi Hernandez’s rescue mission encounters its first major test on Tuesday as Barcelona face Benfica in a game that could decide the scrap in Group E to qualify for the Champions League last 16.

“We cannot ignore our principles,” said Xavi on Saturday, after Barca had just beaten Espanyol 1-0 in his first game in charge to move up to sixth in La Liga. They had needed the help of a dubious Memphis Depay penalty and the post, which Espanyol hit twice late in the second half at Camp Nou.