That it appeared to be Kelly's right knee troubling her will be of concern to many, and of frustration for the player herself. That's because after missing Arsenal's game against West Ham, their second Women's Super League fixture of the season, Kelly had visible strapping on that knee for around six weeks, until early November.
The disappearance of that support seemed to signal Kelly had come through the issue, as did her first Arsenal start for six weeks, handed to her by Gunners boss Renee Slegers just before this international break began in the win over Real Madrid. "She missed the West Ham game and a couple of training sessions but since then she's been building back, and some things take a little bit longer than others, but she's fully fit," her manager said the day before that game.
While the specifics of the issue Kelly was clearly nursing remain unclear, it will not have been encouraging for anyone to see her limp off on Tuesday because of what appeared to be a problem with that same knee she has sported noticeable support on for a large portion of this season, even if the injury itself on the night didn't come across as a bad one.