I'm not doing this or any other quiz, so I'm unbiased as far as it goes. I've employed my usual range of tricks to dig something out of my favourite search engines but I found no conclusive answer for you. All the answers other people have given have been knocked back, I'm presuming for good reason.
As to clues, my best lead to follow up would be a football autobiography which came out in the second half of last year; neither a player nor a manager (hint). The author definitely had a difficult match in Stuttgart and might well have been feeling a bit emotional in the centre-circle at the end of the game. Haven't checked it out, yet, but I will tomorrow.