This year Porsche returned to the top flight of the WEC for the first time since 2017 with the 919 Hybrid LMP1, partnering up with US squad Penske to run its two-car works programme.
So far its best result has been a third place at the Portimao 6 Hours with the #6 car crewed by Vanthoor, Kevin Estre and Andre Lotterer.
The #6 entry had also been in podium contention at Spa, before it shut down on track in hour three and couldn't restart, then all three works-run cars endured troubled runs last time out at the Le Mans 24 Hours as Ferrari ended Toyota's winning streak.
Speaking to Autosport ahead of this weekend's Monza round of the WEC, Vanthoor explained that he anticipated Porsche success to come sooner but still expects it is possible to emulate its IMSA SportsCar Championship arm that took the 963's maiden competition win at Long Beach.
He said: "It’s two names, Porsche Penske together. That’s my mindset; if the best doesn’t have success together, then I don’t know.
"For me, it’s just destined to have success at one point. It just will maybe take a little bit longer than everybody had hoped for.
"That’s the reality where we are. We just need to understand how we can quickly be there where we want to be and then win races."
Source: Autosport