While Advocate General Manuel Campos Sanchez-Bordona's opinion is purely advisory, the Luxembourg-based court usually follows such advice.
His "opinion" was "non-binding" on European Union judges, but most verdicts do follow the advocates' ideas, an European Union court contact told EUobserver.
A group of Scottish and English politicians have brought a case arguing that the United Kingdom would have right to unilaterally cancel the Article 50 process taking the country out of the EU.
Clearly not trusting the rest of the European Union to agree with Britain if Parliament voted to reverse Brexit, the group petitioned the ECJ for the unilateral right to declare the United Kingdom under the continuing control of the exact same European Union that could not be counted upon to serve their interests in the first place.
He said parliament was not necessarily facing a choice between accepting Mrs May's deal or leaving the European Union with no deal, and that "there are other options, and we can stop the clock". In such a scenario, a renegotiation of the existing deal, general election, second referendum and no-deal Brexit could all be possible outcomes.
A court source told AFP that the decision could well be made before the end of the year, but the judges must first decide if the ECJ even accepts jurisdiction in the case.
Meanwhile, British MPs will vote today on whether the government broke parliamentary rules by not publishing the full legal advice it received on its Brexit plan.
"The decision is one that the United Kingdom can make unilaterally - without needed the consent of the other (EU) member states".
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A Scottish court decided in September to seek the European Union tribunal's guidance in a case brought by Maugham, along with a group of Scottish and English lawmakers seeking to reverse the so-called Article 50 process.
A statement from the ECJ said: "In answer to the question from the Scottish court, the Advocate General proposes that the Court of Justice should, in its future judgment, declare that Article 50 TEU allows the unilateral revocation of the notification of the intention to withdraw from the EU, until such time as the Withdrawal Agreement is formally concluded, provided that the revocation has been decided upon in accordance with the member state's constitutional requirements, is formally notified to the European Council and does not involve an abusive practice".
"We know that if the Advocate General's opinion is followed we will know that we can keep all of the options and the special privileges that we enjoy as a member of the EU".
"Plainly it is better for the country if we can unilaterally revoke the Article 50 notice", Maugham added.
Michael Gardner, a partner at law firm Wedlake Bell, said: "This will come as a huge boost to Remain campaigners who wish to stop Brexit".
The "ECJ says the United Kingdom can revoke Article 50 without permission", Nigel Farage, the man who spearheaded the Brexit campaign, said on Twitter.
Those who brought the case argue unilateral revocation is possible and believe it could pave the way for an alternative option to Brexit, such as a People's Vote to enable remaining in the EU.