During the course of that press conference, Bielsa also admitted to "spying" on every team in the league.
But his presentation to the gathered media, who sat in amazement as he demonstrated how much preparation he and his staff carry out on each opponent, has not impressed his fellow bosses. The level of detail they've gone into is pretty standard for the industry. I don't think it's been a particular shock to anyone [in the game], maybe just the way he went about it, certainly doing it in a press conference is different.
"Everybody else in football is looking at it thinking "yeah, we do the same". "Poking around and skulking around a training ground is not part of the game".
The 32-year-old Casilla has signed for northern English club Leeds on a 4 1/2-year contract as Marcelo Bielsa's first signing of the January transfer window.
The position is for an "experienced data integration architect" to work as part of Derby's data and football analysis teams.
Ralph Hasenhuttl, manager of Premier League side Southampton, was perhaps most cutting when he said: "So you got a tactical lesson from him?" Not because you said "you have to do it". They said "no, we want to watch to see what you do". "They don't want to be caught out, but if they can get any information it sounds like they'll do it".
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"In other countries everybody does that", he said.
"That's my opinion. You don't want to have somebody around in these special sessions, and whatever you prepare over the years has no bearing on the last two sessions...especially the last one before a game, only a couple of people should see".
"However great a coach he is, it's the wrong thing to do".
"I don't know. It is more hard". "People diving about all over the place, getting people booked and people crowding around referees - it does my coconut in". I can understand (Derby manager) Frank Lampard's feelings. "But I think it's been over exaggerated".
McBurnie, who has featured regularly under Graham Potter at the Liberty Stadium so far his season, urged the Swans to keep hold of their young player, amidst interest from Leeds. "It's not there in all sessions, because most of the sessions it is not a problem", he said when asked about the row.