flobaba To be honest, I just think we were poor and sloppy in execution. The play was not up to our standards that we've set in the League. You're going to have bad games here and there and obviously Sporting proved to be an uncomfortable opponent for us. We created loads of chances that we didn't take, it took a freak goal from the halfway line to take the game to overtime where we missed some more chances and then we went out on penalties. I'm glad we got (two of those) performance(s) out of the way in the cup competitions rather than getting a game where we're firing blanks in the League.
I don't think Sporting showed anything to really expose Arteta either. Obviously little changes can and should be made to our approach in dealing with opponents like that, but given our current standings the League was always the priority(hence resting Partey and Odegaard).