The Spaniard’s wish to move on from Toro Rosso has finally been granted and he will join Renault next year on a year-long loan whilst remaining part of the Red Bull family.
“I’ve seen that a lot of time Renault has been the fourth-fastest team this year,” Sainz told GP Gazette.
“And what I’ve also seen is the development they’ve had during the season, which also creates a smile on my face, because I know how much they’ve developed and how much effort they are putting into everything.
“I follow them very closely because they also have the same power unit as us [at Toro Rosso]. I know the progress they’ve made.”
While Sainz has not got the move he wanted to Red Bull just yet, he still feels he is making a step forward in his career with Renault.
“I think when a driver becomes a manufacturer driver it’s a step in a career, and it means you are now part of a massive organisation, not only in motorsport, but a car company,” he added.
“Apart from that it’s a manufacturer that wants to become world champions. They want to do it in the medium- to short-term, and they’ve trusted me to help them to do that.
“The next step is the difficult one, and that’s why in 2018 I want to help them to take the next step. If it’s to consolidate as the fourth team or be the third team, I don’t know, this we haven’t talked about yet.
“I want to help them to score as many points as possible, and together with Nico [Hulkenberg] to take them to the next level.”