The English Football League launched a formal investigation on Tuesday after Derby County complained that Leeds United manager Marcelo Bielsa sent a spy to the club’s training ground last week.
The incident happened the day before the Championship clubs met at Elland Road, a game which Leeds United won 2-0.
The EFL have now written to Leeds United requesting their observations after the Yorkshire club apologised to Derby County and reminded Bielsa of the club’s principles of “integrity and honesty”.
Following the victory over Derby County which moved Leeds United top of the second division standings, Bielsa admitted sending a member of his coaching staff to watch Derby train.
The win had given them a four-point cushion at the top.
“The EFL has now determined that it is appropriate to consider this matter in the context of a number of EFL Regulations whilst also noting that the alleged actions appear to contravene the Club’s Charter that all EFL Clubs agreed to in summer 2018,” the EFL said in a statement.
The Football Association are already probing the incident.
Also, the EFL confirmed it would work with the governing body to ensure that any potential action taken “does not prejudice those investigations being undertaken”.