The Football Association have confirmed it will investigate Southampton over the 'spygate' scandal.
In a statement, the FA said: "We will now investigate, and won't comment further until we have assessed the evidence."
Southampton have already been booted out of the Championship play-off final and docked four points from next season's Championship season.
The punishment follows Southampton's admission to multiple violations of EFL rules concerning the illicit recording of rival clubs' training sessions.
The EFL confirmed Southampton faced initial charges on Friday, May 8, with additional allegations following on Sunday, May 17, after further incidents came to light during the original investigation.
The club acknowledged breaking regulations that mandate clubs operate with complete good faith and forbid surveillance of opponents' training within 72 hours of a fixture.
However, it felt that the severity of the punishment given by the EFL was "manifestly disproportionate".
Southampton chief executive Phil Parsons issued an open letter to supporters, saying: "What happened was wrong. The club has admitted breaches of EFL Regulations 3.4 and 127.
The FA have confirmed it will investigate Southampton
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"We are sorry to the other clubs involved, and most of all to the Southampton supporters whose extraordinary loyalty and support this season deserved better from the club."
However, the CEO argued the penalty was grossly disproportionate, noting that Leeds United received a £200,000 fine for a comparable offence.
Southampton, by contrast, have been denied participation in a match Parsons valued at more than £200million, which he described as "by a very considerable distance, the largest penalty ever imposed on an English football club".
Middlesbrough manager Kim Hellberg accused the Saints of cheating following his side's goalless draw at the Riverside Stadium, with Boro losing the second leg 2-1.
The Saints feel the punishment by the EFL is 'manifestly disproportionate'
| GETTYHellberg condemned what he called "disgraceful spying", whilst Saints boss Tonda Eckert walked out of his post-match press conference when asked: "Are you a cheat?"
Following Southampton's exclusion, the EFL announced an earlier kick-off time for the play-off final scheduled for May 23.
Hull City will face Middlesbrough at 3:30pm, an hour earlier than the initial scheduled time.
Hull are understood to be seeking legal advice over whether they should receive automatic promotion to the Premier League.
Hull City will face Middlesbrough at 3:30pm on May 23
| GETTYClub officials are in discussions with lawyers to determine if they have grounds to bypass the final entirely and secure top-flight football without kicking a ball.
Turkish-British owner Acun Ilicali has confirmed his legal team believes there may be a case for direct promotion.
"Under normal circumstances, two teams have reached the final, and one has been disqualified. Our lawyers' opinion is that we should go directly to the Premier League, but they're examining it right now," he told Turkish outlet Asist Analiz.
"We can't say anything definitive. It's a bit of a messy situation."
Hull have not dismissed the possibility of pursuing legal action after Saturday's final, should they remain in the Championship.
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