The three LMP1 factory teams have agreed in principle to offer tests to the top contenders from the LMP2 division of the World Endurance Championship next season.
The move has been proposed by the series' organisation in an attempt to make a category that has attracted only four cars over the full season in 2014 more attractive.
It wants the manufacturers to make cars available to LMP2 frontrunners at a test likely to be scheduled straight after next year's Bahrain finale in November.
Series boss Gerard Neveu told AUTOSPORT: "We are working hard to do something like this at a test after the Bahrain race next year and we have obtained a pre-agreement [from the manufacturers].
"It would help P2 and endurance racing in general by encouraging young drivers into the series."
Toyota motorsport boss Pascal Vasselon said that his team "welcomed the move".
"We support it because we have already done it with Mike [Conway, the teams' test and reserve driver]," he said.
Audi is also supporting, according to motorsport boss Wolfgang Ullrich.
"We are discussing this and we would like to find a solution where we could include the best of the [LMP2] drivers in the same way as we give a chance in a DTM car to the best drivers using Volkswagen engines in Formula 3," he explained.
The series launched a review of LMP2 at the beginning of the year after the shortfall in entries.
A plan to allow all-professional line-ups was rejected by the teams.