Daniel Ricciardo has questioned whether Daniil Kvyat is 'holding back the team' in terms of developing the Red Bull RB11, but says he is himself doing his best to progress the team along.

With Red Bull enduring a lacklustre start to the 2015 F1 season, Ricciardo and Kvyat have been busily working to bring the car up to the speed of its rivals having become mired in the mid-field and up against its sister team Toro Rosso.

Indeed, following the exit of Sebastian Vettel to Ferrari, Ricciardo admits it has been difficult to replicate the feedback that came with his lengthy period in the Red Bull set-up, while he also suggests the relative inexperience of Kvyat is also proving detrimental.

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"Seb had built very good relationships in the team and the feedback in the team was easy because of the time and experience with them, so it is hard to quantify that," he said.

"With Daniil, after the meetings he gives his feedback and what he feels in the car is what he feels. It is hard to say if it is right or wrong. I think he knows what he feels and from what I see he is explaining it as well as he can to the engineers.

"I would like to think it is not holding us back but it is hard to answer that. I think we are doing as well as we can, at least in trying to help the team. I am always thinking of ways we can help them and fast-track the progress but we are doing all we can."

Kvyat participated in the in-season test at the Circuit de Catalunya this week, but warned there will be 'no miracles' in Red Bull's quest to get back to form.