Rumours of Porsche's exit from the World Endurance Championship LMP1 are heating up and the German team is not denying it.

The factory outfit employs Kiwi Le Mans 24 Hour winners Brendon Hartley and Earl Bamber and is currently leading both the drivers' and manufacturers' championships.

"We will make the decision before the end of July," Porsche LMP1 team principal Andreas Seidl said over the weekend.

Audi withdrew from the sport in similar circumstances in 2016.

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The team, with its two Kiwi drivers, won the Le Mans 24 Hour race last month.

They lead both the World Endurance Championship drivers' and manufacturers' standings as well.