Daniel Ricciardo is 28; both he and Red Bull team boss Christian Horner know that his next move will be the most important of his F1 career. File photo: Moises Castillo / AP

Mexico City - Red Bull is prepared to wait for Daniel Ricciardo to decide his Formula One future but has Carlos Sainz as a 'safety net' if he opts to leave after 2018.

Team boss Christian Horner told reporters on Monday he wanted Ricciardo to stay alongside Max Verstappen, who has a long-term contract. Ricciardo will be in the final season of a five-year deal in 2018 and has been linked to Mercedes and Ferrari in media speculation.

"The next move he makes at 28 years of age is a very important one for him," said Horner. "So of course I’m sure he’s going to take the time to make sure the decision is right for him. But he knows the intent very clearly, and I’ve discussed it with him, is that we want him in the team. If that takes another six months, then so be it."

Verstappen won the race at the Autodromo Hermanos Rodriguez, his second victory of the season, while Ricciardo celebrated victory in Azerbaijan in June. His race on Sunday ended after barely a handful of laps, however, with a turbo problem.

Frequent failures 

Horner said: "I think he’s keen to see what engine performance looks like next year, which is understandable."

Red Bull uses Renault engines, branded Tag Heuer. While the former champion has won three times in 2017 and taken more points than Ferrari in recent races, it have also suffered frequent failures.

"He knows how we go about our racing and how we treat the two drivers, which he’s extremely comfortable and happy with," he said of Ricciardo. "I think, as his character has developed and as his personality has come across, he sees the fit between Daniel Ricciardo and Red Bull. I think he sees the capability that we have within the team. And I think he’s very happy in the team."

Safety net

Asked what would happen if Ricciardo decided to leave, Horner said Red Bull was prepared for that.

"That’s why we kept Carlos Sainz on loan," he said. "That’s why we have options around us. We have a safety net but our number one objective is to retain the pairing that we have."

Sainz has been loaned from Toro Rosso to Renault as part of an engine deal that allowed the Red Bull-owned team to end a contract with the French manufacturer and partner Honda in 2018.