Lampard revealed that Derby don't intend to lodge a complaint about the matter but added that Leeds also spied on his team's training session before the sides met in August, with Bielsa's team winning that game 4-1.
"Yesterday I talked to Frank Lampard and he said I didn't respect the rules of fair play".
A visibly furious Frank Lampard has slammed Marcelo Bielsa for sending a Leeds United employee to spy on Derby County after the Argentine accepted full responsibility.
It's true there was someone from Leeds. Which I think is a good thing to do in life, not just football'.
Derby are now in sixth position, while Leeds are league leaders just eight points ahead.
"I am the only one responsible for it, because I didn't ask for the permission of Leeds to do it".
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"Without trying to find a justification, I have been using this kind of practice since the qualifications for the World Cup with Argentina. For some people it is the wrong thing, for others it's not".
Leeds, who thrashed Derby 4-1 in the league meeting in August, have lost their last three games in all competitions and sit two points clear of Norwich at the top of the table.
Derby boss Frank Lampard said: "At least, on a sportsman's level, it's bad in my opinion".
Manager Frank Lampard stopped training until the incident had been resolved. Talking about "I did it somewhere else, it's fine" - that doesn't work for me.
'It's disrupted our build-up to this game, and the unfortunate thing for us is it's disrupted us from our end without doing anything. How you prepare the team is vitally important and we haven't been able to do that on Friday. The man was asked to leave but it wasn't followed up like this time'.
Earlier a Derbyshire Police statement had confirmed a man was removed from a position near the club's training ground.
'What I will say is, we were training the day before the game on team tactics, team shape, personnel, how we're going to press, how we're going to work off the ball.