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Red Bull and Renault will catch up with Mercedes during the 2015 Formula 1 season, the drinks firm's motorsport director Helmut Marko has declared.

Reigning F1 champion team Red Bull has trailed the dominant Mercedes squad throughout 2014 so far, although it did win the Canadian Grand Prix with Daniel Ricciardo after problems for Lewis Hamilton and Nico Rosberg.

Red Bull team principal Christian Horner has been heavily critical of engine supplier Renault in recent weeks, and the French manufacturer carried out a management restructure of its sporting division prior to the British GP.

Horner has backed Renault's changes, and Marko revealed that an action plan was now in place that aimed to close the gap to Mercedes within the next year.

"We start the partnership on a new basis," he said.

"We agree that the current engine is by far not on its limits and can be improved in several areas, all measures within the frozen rules.

"We started the week on Monday with a meeting to determine immediate measures that we will introduce in the upcoming weeks.

"Mid-term we will go further, which should bring us on par with Mercedes during the 2015 season."

Marko added that reliability improvements were on the agenda as well as performance enhancements.

"Both sides know what is possible for us and what we have to do," he said.

Lotus is closing on a deal to switch from Renault to Mercedes power for 2015, but Marko reiterated that Red Bull had no plans to change manufacturers.