Nissan auto plant in Sunderland, northern England, June 24, 2010. JLR, Honda and BMW have all announced plans to idle their factories in the days after Britain is set to leave the European Union in hopes of avoiding potential chaos at the borders.
Local MP Bridget Phillipson, tweeted that the reports "represent deeply troubling news for the north east economy - So many jobs and livelihoods depend on Nissan's success".
The Sunderland plant, which has been active since 1986, employs nearly 7,000 people and produces around 2,000 cars a day.
Around 6700 people work at Nissan in Sunderland and it employs thousands more in the supply chain. May said on Sunday she would seek a "pragmatic solution". The constant uncertainty, the chaotic government.
There had been concerns that Nissan - part-owned by France's Renault - could move production to France in future to avoid any post-Brexit EU tariffs.
They have reiterated today their commitment to the United Kingdom by continuing to manufacture in Sunderland the current Qashqai, Leaf and Juke models and the new Qashqai model from 2020.
A report by the Society of Motor Manufacturers and Traders (SMMT) said investment had effectively "stalled" amid fears over the UK's future trading prospects with the EU.More news: Venezuela opposition rally to keep up pressure on Maduro
British politicians have sharply criticized May's Brexit deal and voted it down in Parliament.
It comes after Ford confirmed on Friday that it would be cutting around 370 jobs at its Bridgend plant as it restructures its production across Europe and the United Kingdom.
The company said the "voluntary separation programme" at the Welsh factory is needed to cut costs and create a "sustainably profitable business" in Europe.
Ford announced it was cutting jobs in the United Kingdom as part of a regional plan.
Nissan is expected to announce next week the cancellation of plans to manufacture its X-Trail model in the UK.
"Our workforce in Sunderland has our full confidence, and will continue to benefit from the investment planned for Juke and Qashqai", de Ficchy said in the statement.
Business Secretary Greg Clark said: "Nissan's announcement is no doubt a blow to the sector and the region, but the company has confirmed that no jobs will be lost as this was to be a further significant expansion of the site and the workforce".
Nissan said it will consolidate production of the next generation X-Trail at its plant in Kyushu, Japan, where the model is now produced, allowing the company to reduce investment costs in the early stages of the project.