And the former goalkeeper does not think Bielsa deserves to be punished.
“No, because this has gone on for a long time,” he said on talkSPORT.
“We knew when we used to play away in Europe that you showed nothing in set-plays.
“You always got to train in the stadium the night before and you knew there would be people in the ground who would be looking.
David Seaman has had his say on the Leeds United spy scandal (Image: GETTY)
David Seaman says spying happened all the time at Arsenal (Image: GETTY)
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David Seaman doubts Leeds United will be punished (Image: GETTY)
“Even when we were at Arsenal, when we moved training grounds to the one next door to Watford’s (at London Colney) we had massive mounds built to cover the footpath.
“There were shrubs and trees and everything planted on top so nobody could see into our training ground.
“It’s been going on and you take caution. You make sure that you’re looked after and that people can’t see in.”
Seaman’s comments come after former Nottingham Forest and England star Stuart Pearce called on the Derby result to be reversed.
“Let the punishment fit the crime. That statement fits this brilliantly.
“If you’ve sent someone all the way down from Leeds to Derby to stand outside the training ground and when asked about it you say ‘yes he was sent down by me, he put his expenses sheet in and all that’ then I think ‘fine, no problem, you won 2-0 against Derby but it’s affected Derby. It’s not in the spirit of the game.”
Leeds play Stoke on Saturday as they seek to extend their lead at the top of the Championship.
Bielsa is tasked with hauling Leeds back into the Premier League after 15 years outside of the top flight.
Scott Carson says Derby need to move on from the Leeds United defeat (Image: GETTY)
Meanwhile, former Leeds goalkeeper Scott Carson - who played for Derby at Elland Road last Friday - insists the Rams cannot blame the loss on the spying scandal.
"We need to hold our hands up and work out how we can improve," Carson said.
"Leeds are a good side and are difficult to play against.
“They are a team that we need to aspire to be like if we want to achieve what we want to achieve."