Arsenal are unchanged for the third successive match in a row as Mikel Arteta sticks to what he knows.
That means Leandro Trossard continues to lead the line alongside Bukayo Saka and Gabriel Martinelli up front.
Jakub Kiwior continues at left-back, with no Gabriel Jesus, Oleksandr Zinchenko and Takehiro Tomiyasu available.
FC Porto team news
Team to play Arsenal: Diogo Costa; Mario, Otavia, Pepe, Wendell; Nico Gonzalez, Varela; Conceicao, Pepe, Galeno; Evanilson
Substitutes: Ramos, Cardoso, Eustaquio, Grujic, Sanchez, Jaime, Namaso Franco, Baro, Martinez, Borge, Ze Pedro
Arsenal team news
Team to play FC Porto: Raya; White, Saliba, Gabriel, Kiwior; Rice, Odegaard, Havertz; Saka, Trossard, Martinelli
Substitutes: Ramsdale, Hein, Smith Rowe, Nketiah, Cedric, Jorginho, Vieira, Nelson, Elneny, Nwaneri, Sweet, Heaven