Ferrari's customer teams are behind in payments to the Maranello marque.
Expressing concern about the future of Hinwil based Sauber, correspondent Roger Benoit quoted his authoritative Italian colleague Pino Allievi as saying: "Ferrari has never dropped a long-term partner."
Both Sauber and Marussia are undoubtedly struggling financially, with Speed Week reporting rumours earlier this week that Marussia may not make it to Monza this weekend.
But it emerges that Marussia's race transporters are at least en route to the Autodromo Nazionale.
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