The Championship play-off final could be thrown into chaos after Middlesbrough formally demanded that Southampton be expelled from the competition over a spying scandal that has rocked English football's second tier.

The controversy erupted when Southampton were accused of sending a spy to monitor Middlesbrough's training session at their Rockliffe Park facility last Thursday, just days before the two sides met in the first leg of their play-off semi-final. Boro, who ultimately lost the two-legged tie in extra time, are now crying foul.

In a strongly worded statement, the club condemned the alleged conduct as a direct attack on "sporting integrity and fair competition." They argued that nothing less than a sporting sanction—namely, expulsion from the play-offs—would deliver justice. "The only fair outcome is for Southampton to be removed from the final," the statement read.

The EFL has launched a formal investigation into the incident, and a hearing has been scheduled. However, Middlesbrough will not be permitted to participate in that hearing, a detail that has only added to the tension surrounding the case.

Southampton, who booked their place in the final with a dramatic extra-time victory over Boro at St. Mary's, are now set to face Hull City on May 23 for a shot at Premier League promotion. But that date could be in jeopardy depending on the outcome of the EFL's inquiry. If the league rules against the Saints, the entire play-off schedule could be thrown into disarray.

With promotion—and the massive financial windfall that comes with it—hanging in the balance, this saga is far from over. For fans and neutrals alike, it's a reminder that in the high-stakes world of Championship football, the drama doesn't stop at the final whistle.