Nico Hulkenberg has said that he expects his new Renault teammate to be "fast".
Departing Toro Rosso driver Carlos Sainz, who will be paired with German Hulkenberg full-time from next year, will get an early start at Renault in the last four races of 2017.
Hulkenberg told Auto Motor und Sport: "I only know him from the paddock, but he is an ambitious driver.
"He is still young and wild, but he is certainly fast."
Asked if he is looking forward to being partnered by 23-year-old Sainz, having shared the yellow-coloured garage with ousted Jolyon Palmer until now, Hulkenberg added: "It's ok. I will continue to do my own thing."
The 30-year-old admitted that he may have an advantage over Sainz at the beginning of their new partnership.
"It's hard to estimate, but of course you always need a certain period of familiarisation. We'll see," said Hulkenberg.
The current season continues with the United States Grand Prix on October 22.
