Ricciardo has won the Chinese and Monaco grand prixs this season
Red Bull team boss Christian Horner says he would be "surprised" if Daniel Ricciardo left Red Bull this season.
He is out of contract at the end of the year and has held talks with McLaren and Renault, while there are also seats available at Mercedes and Ferrari.
Daniel Ricciardo (right) has won seven grands prix, whilst Fernando Alonso (left) has won 32
McLaren are in talks with Red Bull's Daniel Ricciardo about driving for them in Formula 1 next year.
The Australian, 28, is out of contract at the end of this year, with seats potentially open at top teams Mercedes and Ferrari next season.
Formula 1 has extended its contract with the Belgian Grand Prix until 2021.
The move secures the immediate future on the calendar of one of the world's classic race tracks - Spa-Francorchamps in the Ardennes mountains.
Red Bull are behind Mercedes and Ferrari in the constructors' standings this year
Red Bull will split with Renault at the end of this season and use Honda engines for the next two years.
The move ends a 12-year relationship during which Red Bull and Renault won four consecutive world title doubles from 2010 to 2013.
Toyota TS050 Hybrid LMP1's drivers Fernando Alonso of Spain (L), Kazuki Nakajima of Japan (R) and Sebastien Buemi of Switzerland (C), celebrate on the podium after winning, completes the second part of the Spaniard's motorsport 'triple crown'
Fernando Alonso won Le Mans 24 Hours at the first attempt as he and team-mates Sebastien Buemi and Kazuki Nakajima finally ended Toyota's long drought.
Toyota had never won the sportscar race despite years of trying but finally delivered in an event in which they were effectively without opposition.
