Carlos Sainz has "100 percent confidence" that Red Bull will do what is right for both the senior team and Toro Rosso.
Just weeks before the end of this season, both Red Bull Racing and Toro Rosso are without engines for 2016.
Parting ways with Renault, turned down by Mercedes and with reports claiming Ferrari are only willing to offer 2015 engines, Dietrich Mateschitz has threatened to walk away from F1.
The F1 team owner is adamant he won't remain in the sport if his teams do not have competitive engines.
But despite that threat hanging over Toro Rosso, Sainz has every confidence in Red Bull.
"To be honest, I don't know – and I am not really taking care of this matter too much," the Spaniard told Motorsport.com.
"We are here to drive and our job is to extract maximum performance of the car.
"The team is working hard now more than ever to find something for next year, but the team needs to get on and design rear of car and it is getting late.
"I have full trust they will come to a solution and agreement.
"Red Bull has done a lot for the sport and F1, and will end up having a decent engine and package for next year.
"We just need to wait, be patient and trust Red Bull will take the right decision, they will do the best for the brand, both teams. And there is nothing we can do.
"We are sitting here waiting but having 100 percent confidence on them and, as I said before, Red Bull has done a lot for F1 and F1 will give them a bit back what they have done for them. With all this, I am pretty sure that next year we can be here."