Felipe Massa, a man who knows a thing or two about having Championship-winning team-mates, believes Valtteri Bottas has what it takes to challenge for titles.
Competing in only his second Formula 1 season, Williams driver Bottas has already appeared on the podium four times and finds himself fifth in the Drivers' Championship with 110 points.
Massa, who partnered both Michael Schumacher and Kimi Raikkonen when they won titles at Ferrari, heaped praise on the Finn.
"He's a great driver," the Brazilian is quoted as saying by Autosport. "He's shown since the beginning of the season that he's a great driver; that he's quick, that he's competitive, that he's clever, intelligent, working very hard.
"It's clear he's doing everything correct.
"People need to see him as a great driver in the field. Not just him, [Daniel] Ricciardo too."
Asked if he believed Bottas could fight for World Championships, Massa replied: "He can, definitely. He's still young."