FC Porto captain Pepe has detailed what the Portugues side need to do if they’re to eliminate Arsenal from the UEFA Champions League. The Gunners fell to a late 1-0 defeat last night as the north London side were outplayed physically and mentally by Porto, who pulled off the perfect game plan against Arsenal. Trailing in the two-legged affair, Arsenal know they now need a massive performance at the Emirates Stadium next week if they’re to progress to the next round of the Champions League. Pepe says Porto must be ‘perfect’ to eliminate Arsenal from the Champions LeagueAnd speaking to the Eveni…