"We are however continuing to recruit large numbers of highly skilled engineers, graduates and apprentices as we are over-proportionally invest in new products and technologies".
The company stressed it remains committed to its United Kingdom plants, having invested more than 4 billion pounds since 2010 to future-proof manufacturing technologies to deliver new models.
He said: "JLR appears to be especially exposed as over 90 per cent of sales are diesel".
JLR, Britain's biggest auto manufacturer, employs 40,000 people in the United Kingdom, of whom a quarter work at Solihull. There are 3,200 people employed at the Castle Bromwich site and a further 10,000 at Solihull.
A spokesman for JLR declined to confirm the news, but released a statement saying: "As is standard business practice, JLR regularly reviews its production schedules to ensure market demand is balanced globally".
That was 2.3 per cent fewer than in 2016.
A source told new agency Reuters that 1,000 roles would be slashed as part of the moves.
"Ongoing uncertainty surrounding Brexit is being felt by customers at home and in Europe", the company said in January.
'As an industry in which investment is heavily reliant on forward planning, industry bodies have been lobbying extensively for greater clarity around a Brexit trade deal. Many of them are based at the Solihull facility.
The company sold 614,309 vehicles in the year to 31 March 2018, up 1.7 per cent on 2017. JLR blamed the continuing uncertainty over diesel for the downturn.