Tonight’s tie with FC Porto is perhaps the most important game of Mikel Arteta’s time as Arsenal manager so far. Having lost the first leg 1-0, Arsenal welcome their Portuguese guests to the Emirates on a night in which they’ll need the likes of Kai Havertz and Bukayo Saka in top form. Although this is still a young Arsenal squad, they shouldn’t suffer from any stage fright – they’ve already seen these types of contests in last year’s title race. And despite not being successful on that occasion, it should all prove as valuable experience. Of course, the addition of Declan Rice provides reason…