Manor says its "plan A" is to keep Indonesian rookie Rio Haryanto on the team in 2016.
In Hungary, it emerged that alternatives like Stoffel Vandoorne and Jordan King are in the running because Haryanto’s sponsorship had dried up mid-season.
"Plan A is to keep Rio on board for the remainder of the season, but we have other options," team chief Dave Ryan is quoted by the Dutch newspaper Algemeen Dagblad.