Barcelona came from behind to beat Porto 2-1 on Tuesday and reach the Champions League knock-out rounds for the first time in three seasons. Brazilian winger Pepe sent Porto ahead but Barcelona's Portuguese duo Joao Cancelo and Joao Felix both netted to turn the game on its head. The former Benfica pair pounced against their old club's rivals to ensure Xavi Hernandez's team would not face a humiliating group stage exit as they did in both of the last two seasons. Defeat by Shakhtar Donetsk in Hamburg in their previous European match made Barca nervous, with poor performances domestically adding to their jitters. However despite conceding first, Cancelo quickly levelled and he set up Felix in the second half for the winner to delight Barca's fans at the Olympic Stadium on the city's Montjuic hill. 

"It was a final and we won it ... we've put the club in the last 16, which is where it deserves to be," Cancelo told Movistar. "When results don't come, your confidence is not the same." Xavi shook up his side with Cancelo switching to left-back and Oriol Romeu dropped for Ilkay Gundogan after Barcelona's 1-1 draw at Rayo Vallecano on Saturday, the latest in a string of sub-par displays. Inaki Pena kept his place in goal for the Catalans while first choice Marc-Andre ter Stegen is out with back pain and made several saves as both sides racked up good chances. Porto's Pepe, whistled by Barca fans because of his Real Madrid past, became the fifth oldest player in Champions League history at 40 years and 275 days. The veteran Portuguese centre-back was in the right place at the right time to block Felix's early effort, after Raphinha tested Diogo Costa with a low drive. Porto's Medhi Taremi beat Pena after 25 minutes but the goal was ruled out for offside against the Iranian striker.