Leeds United manager Marcelo Bielsa insists he did nothing wrong by having a spy watch Derby County training before last night's win.

The Football Association have launched an investigation into the furore that overshadowed Friday's Championship showdown.

Before the clash, Bielsa held his hands up, telling Sky Sports: "It's true there was someone from Leeds United. The responsible of this incident is me. It doesn't matter if this is illegal or legal but it is right or wrong.

"For me it's enough that Frank Lampard and Derby County felt it was not the right thing to do and that I didn't behave well.

"I talked to Lampard and he told me that I didn't respect the fair play rules. I have a different point of view on it but the important thing is what Lampard and Derby think.

"I am the only one responsible for it because I didn't ask the club Leeds permission to do that.

"Without trying to find a justification, I have been using this kind of practice since the qualifications for the World Cup with Argentina.

"This is not illegal, we have been doing it publicly, we talk about it in the press, for some people it is the wrong thing to do but for other people it is not the wrong thing to do."