Daniel Ricciardo's bosses at Red Bull have ruled out releasing the Australian driver to join Mercedes as Nico Rosberg's replacement.

Following the Formula One world champion's shock retirement, Mercedes will begin their search for a new driver on Monday with Ricciardo having just completed a career-best season.

Rosberg's decision to walk away from motor racing just five days after sealing his maiden title leaves Mercedes - Formula One's all-conquering team, who have won 51 of the past 59 races - with a vacant seat next season.

The 27-year-old Ricciardo confirmed his status as one of the sport's most exciting talents when he claimed third in the championship behind Mercedes duo Rosberg and Lewis Hamilton.