Red Bull Racing boss Christian Horner has come out in support of his drivers Daniel Ricciardo and Daniil Kvyat for their resolve following a tough start to the season for the team.

In a year that has seen the four-time F1 title winning outfit struggle to get beyond the mid-pack fight, Red Bull is currently classified fourth in the constructors' standings after eight races, 64 points behind third place Williams.

It is a trying period that Horner - who has been publically critical of engine supplier Renault for its failure to improve its power unit package - admits has had an effect on the team, not least the drivers Ricciardo and Kvyat.

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Indeed, though it currently appears unlikely that new team leader Ricciardo will build on the three wins he achieved with Red Bull in 2014, Horner is pleased with his efforts in a less competitive car.

"It's great (working with him)! He gets his head down and gets on with it and he's a positive light. Things will change, in sport, sometimes you have a bit of a bad run and he's been a bit unlucky but hopefully his luck is about to change. He's been driving incredibly well and hopefully soon we will be able to give him a car he will be able to use to his full potential."

Having come under scrutiny after a difficult start to the year, Horner believes Kvyat's efforts of late - particularly his run to fourth place in the Monaco Grand Prix - have vindicated the decision to hire him from Toro Rosso.

"I think he's growing and growing," he said. "We always knew coming into the season that he is pretty raw, he is a young guy, only one season experience and he's had so many issues with engine failures and bits and pieces that it is very hard to judge him in the first few races.

"Since Monaco, as you say, his confidence has grown, he drove a great race in Montreal and was in good form again in Austria but was just unlucky at the start with the cars stalling and slowing in front of him that he did some damage to the underneath of his chassis."

Ricciardo and Kvyat are currently classified seventh and eighth in the overall standings.