Arsenal are sitting pretty at the top of the Premier League but have a fight on their hands to stay in Champions League contention.
The Gunners were frustrated during the first leg of their Round of 16 clash with Porto before Galeno scored a superb winner for the hosts deep into stoppage time.
It was an unusually shot-shy performance from Mikel Arteta's side, who have been in free-scoring form domestically over recent weeks.
They will hope to bring that form to bear against Porto and banish an awful record at this stage of the Champions League.
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Arteta will recall David Raya to the starting XI after the Spanish goalkeeper was ineligible to face his parent club in the 2-1 Premier League weekend win over Brentford.
Gabriel Martinelli is battling to shake off a foot injury and remains a major doubt. Fellow Brazil forward Gabriel Jesus is pushing for a return to the starting XI but could be kept in reserve on the bench for if Arteta needs to chase the tie late on.
Any Jesus start might have to come at Leandro Trossard's expense on the left flank, where Martinelli would normally operate. Kai Havertz played at centre-forward and scored for a fourth successive Premier League game against Brentford.
Oleksandr Zinchenko is fit again and could replace Jakub Kiwior at left-back. Takehiro Tomiyasu has returned to training and provides another full-back option.
Arsenal projected XI (4-3-3, right to left): Raya (GK) — White, Saliba, Gabriel, Kiwior — Rice, Jorginho, Odegaard — Saka, Havertz, Trossard.
Mehdi Taremi could add extra firepower to the Porto attack after returning from a thigh complaint. Left-back Wendell has recovered from the knock that
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