Christian Horner says Red Bull is determined to catch Mercedes this winter "to really give them a hard time".

Daniel Ricciardo was the only non-Mercedes driver to win a race in 2014 as he took victories in Canada, Hungary and Belgium to break up a year dominated by Lewis Hamilton and Nico Rosberg. Despite the Mercedes power unit being comfortably the strongest on the grid, Red Bull delivered another impressive season to finish second in the constructors' championship with Renault.

While Horner described the comeback from a poor pre-season in 2014 as one of the team's biggest achievements, the Red Bull team principal says the main motivation remains to close the substantial gap to this year's world champions.

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Asked by Crash.net if the challenge of catching Mercedes can be seen as another opportunity for Red Bull to prove its quality after four years of dominance itself, Horner replied: "I don't think the team has got anything to prove, I think the team is just hungry to achieve more success.

"If you think in the last six years there's only one team that's beaten us and that's a remarkable performance and achievement, particularly with the regulation changes during those years and of course the power unit regulation change that there's been for this year. Of course everything evolves, but there's a real desire within the team to really give them a hard time."