Leeds United's iconic Argentine manager Marcelo Bielsa admitted on Wednesday he has spied on training sessions of all the Yorkshire side's opponents this season, adding more fuel to the debate over the tactic.

Bielsa's side are four points clear at the top of the Championship, England football's second tier, after beating Derby County 2-0 on Friday.

But the match was overshadowed by Bielsa's admission he sent a club employee to spy on Derby's training session a day before the game.

In a statement, Leeds owner Andrea Radrizzani apologised on Saturday for the incident, which is now the subject of a Football Association investigation.

Bielsa called an impromptu press conference on Wednesday, sparking rumours he could sensationally resign as he has in shock fashion at Lazio and Marseille in the past.

"I observed all the rivals we played against. We watched all the training sessions before we played them," said Bielsa.

"My goal is to make this easier for the investigation. By doing this I assume the possible sanctions by the authorities."