Arsenal travel to Porto for the first leg of their Champions League last-16 tie on Wednesday as they bid to make the quarter-finals for the first time since 2009-10.
The Gunners topped their group on their return to the competition after a six-year absence and face the 30-time Portuguese champions for a place in the last eight.
While Mikel Arteta's side are also fighting for the Premier League title, Porto are third in Portugal's Primera Liga, seven points off the top.
Sergio Conceicao's team qualified second in Group H, losing out to Barcelona for top spot on head-to-head results.