Frank Lampard's Derby County lost to Bielsa's Leeds United 2-0 and much of the focus fell on the pre-match build up when a Leeds United employee was spotted acting suspiciously around Derby's training ground on Thursday.
The issue has received widespread condemnation, with former Newcastle United and Tottenham midfielder Jermaine Jenas - now a prominent pundit - calling for Leeds to be hit with a points deduction, while Keith Andrew labelled the incident "disgusting". I didn't behave well. "I am responsible for it".
Leeds United have made a formal apology for the actions of Marcelo Bielsa and rebuked their manager, after he admitted having sent a spy to watch Derby County in training before Friday's Championship meeting between the two clubs.
The former Argentina manager said: "I am the only one responsible for it, because I didn't ask for the permission of Leeds to do it". We talk about it in the press. Leeds is managed by Argentine coach Marcelo Bielsa, who is known for his meticulous planning and attention to detail.
Despite the unsporting act, Bielsa is unlikely to face punishment from the club and lose his job.
Lampard and Bielsa shook hands before the match, but the Derby manager said his counterpart was guilty of unsportsmanlike conduct.
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An unimpressed Lampard downplayed suggestions of an EFL complaint.
"Of course I don't think it's right and I'm not sure anyone who's played sport at any level would think it's right".
Derby also reached the fourth round of the Carabao Cup beating Manchester United at Old Trafford before going out to Lampard's old club Chelsea, while also drawing with Southampton in the third round of the FA Cup.
"If we're gonna talk about "culturally I did it somewhere else and it was fine", then that doesn't work for me". It's disrupted our preparations. "Now Leeds can beat you 4-1, they're a fantastic team, but we had somebody in the bushes that day". The man was seen at the perimeter fence, inside which Derby's players were training.
Gary Neville, former Manchester United player and England assistant coach, has criticised the press for taking the moral high ground in the debate, recalling times when journalists would send spies to watch England train at worldwide tournaments and publish tactics, effectively doing the opposition's preparation for them.