Three takeaways as Arsenal make Porto pay the penalty

How will this affect Arsenal's title bid and Arsenal still have much to learn when it comes to Europe.

GUNNING FOR GLORY: Arsenal players celebrate after winning the penalty shoot-out. Photo credit: Zac Goodwin/PA Wire.

How will this affect Arsenal's title bid?

In normal circumstances, seeing your preferred first-choice line-up forced to play extra time in a high-stakes, high-standard cup tie would leave a Premier League title-chasing manager cursing.