The English Football League has indicated that Southampton could be kicked out of the playoffs and that the date of the Championship playoff final may be delayed if the club are found guilty of breaching regulations.

Southampton have been charged by the EFL for allegedly spying on Middlesbrough’s training within 72 hours of their first-leg meeting and for not acting “with the utmost good faith”.

Before Saints beat Boro in Tuesday’s second leg, the club confirmed they had launched an internal review into the allegations of misconduct. The independent disciplinary commission will hear the case by Tuesday 19 May, four days before the scheduled playoff final at Wembley.

In a statement released on Thursday providing an “interim update”, the EFL said: “The commission will issue its decision as soon as possible following consideration of the relevant submissions and evidence.”

The EFL reiterated the commission, rather than the league, controls the proposed timetable, adding: “Supporters should, however be aware that the outcome of the disciplinary proceedings may yet result in changes to the fixture. The EFL has a number of contingency plans should they be required, which also includes consideration of any appeal process, if required.”

It said Hull and Southampton would share ticket sale information on Thursday and that “supporters should consider the situation when booking any associated travel and accommodation”.

Hull, guaranteed a place in the Wembley showpiece, are understood to be frustrated at being limbo, with increasing doubts over their final opponents and the possibility the game could be postponed.