Manor are planning to replace Will Stevens with Indonesian racer Rio Haryanto, according to The Telegraph.
24-year-old Stevens, who raced for the backmarker team throughout 2015, is thought to be on the verge of quitting the team for new opportunities.
"Stevens is likely to try racing elsewhere, perhaps in America, before seeking again to make it in formula one," correspondent Daniel Johnson wrote.
There are also rumours Stevens could now be looking to move to Williams to be reserve driver, replacing the recently-departed Adrian Sutil.
Johnson added that confirmation of GP2 driver Haryanto's deal is "expected in the next few days".
