Kieran Tierney is the one Arsenal player walking the disciplinary tight-rope if he is to feature in the Europa League round of 16 first-leg clash against Sporting CP on Thursday evening.
Squad rotation is expected from Gunners manager Mikel Arteta with this being his side's third game in the space of a week, not to mention they have a London derby away at Fulham three days later in what is an important fixture with regards to the Premier League title race.
Among the Arsenal senior players in contention to return to the starting line-up in Lisbon is Tierney, who hasn't started a Premier League game since the Boxing Day win over West Ham United as it has become apparent that Oleksandr Zinchenko is the first-choice left-back when fit and available for selection.