Derby manager Lampard was visibly annoyed at the spy incident when he spoke to Sky Sports, and said Leeds United made the same attempt earlier in the season.
Marcelo Bielsa admitted he sent a spy to the Derby County training ground ahead of their clash on Friday which didn’t go down well with the Chelsea legend.
“We had somebody the day before our first game against them which we lost 4-1. Leeds can beat you 4-1 because they are a fantastic team but they had someone in the bushes that day. The man was asked to leave but it wasn’t followed up like it has been this time.
“On a sportsman’s level, it’s bad. 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.
“The training stopped because the police came on the training ground, then it went away. We were training on team tactics, team shape, personnel, how we are going to press, how we will work off the ball, the fact Harry Wilson wasn’t training would become evident, so the person who is watching will see all of that.
“If somebody wants to say that is not relevant, then if tactics aren’t relevant that means Pep Guardiola, Mauricio Pochettino, Jurgen Klopp, all the great managers, are just lucky. If preparation and tactics are not part of the game and quite sacred that you can work on them in your own training ground then I think they must be lucky managers.
“I don’t care if it’s cultural. If possibilities come up to travel later in my career then when I travel to that country I will find out what the etiquette is in that country and I will abide by it, which I think is a good thing to do in life, not just football.
“I don’t think we need to [make a complaint] because he’s admitted it. It’s up to the league to see how they deal with.”