Bayern Munich claimed "a spectacular name" would be signing for the club on Thursday, but provoked an angry response from their fans when it was found to be a marketing stunt.
The German club attempted to gain interest in their new marketing tool - an app - by creating a huge wave of speculation over who the new signing would be.
Fans were invited to log on and watch the deal unfurl on their official Facebook page, but were let down when general manager Christian Nerlinger revealed an envelope with the users' own Facebook profile pictures on it. In addition, the users also saw their own name appear on the back of a Bayern Munich No. 8 shirt.
"Dear fans, you probably already noticed, that we did not sign a new player," a statement on Bayern Munich's Facebook page read. "This app is for our fans to show the importance of you for our club."
"Every single FCB fan is the 'spectacular new signing,' our 12th man!", announced the club on their official site later.
However, within minutes, an angry backlash from Bayern fans appeared as over 3,000 users (and climbing) accused the club of wasting their time and getting their hopes up for nothing.
"Based on the many comments we received, there are many Facebook fans of Bayern Munich who were not happy with our action," the German club said in a statement on Friday.
"We are sorry. It was not our intention to disappoint with the new FC Bayern app."
Bayern are still believed to be interested in bringing in a striker in January, with Dortmund's Polish international Robert Lewandowski top of their wishlist.