He added that a no deal Brexit would be "catastrophic" for the European Union and United Kingdom and he would seek to avoid this scenario.
It was tweeted by Jo Maugham, a lawyer who successfully brought a challenge in Scotland over the suspension.
"The (submissions from Johnson's lawyers) contemplate a world where the Supreme Court rules this prorogation unlawful and the government is plainly contemplating, in that world, continuing the prorogation until October 14", Maugham said on Sky News.
Major believes it is "inescapable" that Johnson's decision was motivated "by his political interest in ensuring that there was no activity in parliament" ahead of a crucial European Union summit on October 17-18.
The SNP MP joined Jo Maugham QC outside court after the final day of the hearing into whether Prime Minister Boris Johnson has acted lawfully in proroguing parliament.
Parliament is prorogued about once a year so that the government can launch a new program of legislation with a formal State Opening of Parliament and a policy speech read by Queen Elizabeth II.
Mr Johnson's lawyers had been asked by the court to explain what he would do if the court found against him. "It is about how we are governed, about preserving our ancient democratic freedoms, and trying at all costs to stop a risky precedent being created that threatens constitutionally, politically and economically to impoverish us all", said Miller, in reference to her appeal.
But Rispal cautioned that Britain's rush for post-Brexit deals with other countries will have to wait until the actual economic fallout of the departure can be assessed.
The government says the suspension is routine and not motivated by Brexit, and argues that judges should not interfere in political decisions for fear of upsetting the delicate balance of powers between legislature, executive and judiciary in Britain's largely unwritten constitution.
The Scottish judges, however, said the prorogation was unlawful because "it was motivated by the improper goal of stymieing Parliament".
Gina Miller has said her case is much more important than even Brexit.
A maximum 11 of the 12 Supreme Court judges are hearing the case.
The announcement will be made next week by the Supreme Court on whether or not the prorogation was unlawful.
Among Johnson's opponents at the Supreme Court hearing was one of his predecessors as prime minister and Conservative Party leader, John Major, who submitted a written witness statement saying that the reason given by Johnson for the suspension was not true.
The court not is expected to rule immediately, but a judgment could come at the end of this week or early next week.
Unlike most British court proceedings, Supreme Court sessions can be broadcast, and this one will be streamed live online.
The government could also start the new session of Parliament - now scheduled to begin October 14 - earlier than planned.
Johnson says he will not seek a delay under any circumstances, though it's not clear how he could avoid it.