Jerome Boateng could not eat for two days after Bayern Munich's Champions League final loss to Chelsea in 2012.
Tuesday's Champions League Glash has been deemed "high risk" by the authorities in the Spanish capital after previous incidents involving Legia fans.
The past meets the present on Wednesday, as Pep heads back to the Nou Camp - this time in charge of Manchester City.
Stones is preparing to play at the Camp Nou for the first time in his career on Wednesday when City take on Barcelona.
Pep Guardiola returns to the Camp Nou on Wednesday to lead Manchester City against Barca in their Champions League group C showdown.
McCourt completed the estimated €45m purchase of a controlling stake in the French club on Monday.