Nico Rosberg admits Red Bull is a threat to Mercedes at the Monaco Grand Prix after the two teams were closely matched in practice.

In the morning session - the only representative one due to heavy rain before FP2 - both Rosberg and Lewis Hamilton were separated by just 0.032s and had Daniel Ricciardo 0.2s behind. With Sebastian Vettel also quick in the little dry running in the afternoon, Red Bull appears to be in a position to challenge Mercedes and Rosberg said he believed the pace difference was genuine.

"That was a very good day," Rosberg said. "It seems that we are looking very quick here again, although our main competitors seems to be a little closer to us than in Barcelona. I still need to find my perfect set-up so there is still some work for us to do tomorrow to get ready for the weekend."

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But Rosberg said any set-up issues are not uncommon for Thursday's practice sessions in Monaco.

"It felt OK; not perfect yet but that's normal at this time of the weekend in Monaco so it's a work in progress."

With FP2 being wet, Rosberg ended the session in 20th place but said he hadn't seen the point in setting a quick time.

"The conditions weren't great this afternoon so I didn't take any risks as there was nothing to learn on the wet parts of the track."