(CNN)Leeds United's Argentine manager Marcelo Bielsa has left his club embarrassed after trying to spy on an opposition team ahead of a key game in its bid to win promotion to the English Premier League.
Leeds United apologizes to Derby County over 'spygate'
Ahead of Friday's Championship game in English football's second tier between Leeds and Derby County, Bielsa admitted to sending a spy to watch the opposition at their training ground on Thursday.
On Saturday, Leeds said its owner Andrea Radrizzani had met with Derby County counterpat Mel Morris "to formally apologize for Marcelo's actions."
"Following comments made by Marcelo Bielsa yesterday the club will look to work with our head coach and his staff to remind them of the integrity and honesty which are the foundations that Leeds United is built on," said a Leeds statement on its website.
The incident has been dubbed "spygate" by Britain's media.
"I am responsible for it," Bielsa, who managed the Argentina national team between 1998 and 2004, told Sky Sports on Friday.
"It doesn't matter if this is legal or illegal, or right or wrong ... for me, it is enough that Frank Lampard and Derby felt it was not the right thing to do, for me to believe that I didn't behave well," added Bielsa, referring to the Derby manager.
"Yesterday I talked to Frank Lampard and he said I didn't respect the rules of fair play. I have a different point of view on it, but the important thing is what Frank Lampard and Derby think.
"I am the only one responsible for it, because I didn't ask for the permission of Leeds to do it.
"Without trying to find a justification, I have been using this kind of practice since the qualifiers for the World Cup with Argentina. It is not illegal, we have been doing it publicly and we talk about it in the press."
Leeds won Friday's game 2-0 to move five points clear at the top of the Championship to leave Derby 11 points behind in sixth place.
"On a sportsman's level, it's bad," Lampard told Sky Sports. "If we are going to talk about culturally and say I did it somewhere else and it's fine, I don't believe that.
"It's disrupted our build-up to the game. People will say I am making an excuse, but I will speak like this after the game whether we win, lose or draw."