After winning three races in 2014 and finishing third in the driver's championship, the Australian has endured a frustrating 2015, registering just one podium finish and constant problems with the Renault engine powering Red Bull.
But with Renault saying they would stop supplying engines to Formula One teams next year, Red Bull is looking for a new engine. There are just three other engine suppliers in the sport - Mercedes, Ferrari and Honda - with Red Bull widely expected to use Ferrari engines next year.
Renault won four championships in a row with Red Bull from 2010-13 but the French manufacturer has been lagging behind champions Mercedes and Ferrari since the complex new V6 turbo hybrid power units were introduced in 2014. Like Renault, Honda has also struggled this year.
Relations between Red Bull and Renault have been prickly all year but Ricciardo, 26, was diplomatic when asked about the Renault engines this season. He said he was still unsure what would happen but was looking forward to driving a more competitive car next year.
Despite his frustrations, the Australian was at least hopeful for a better showing at this weekend's Singapore Grand Prix.