Wolff said he was "bloody worried" about Monte Carlo.
Lewis Hamilton says that even Mercedes's top bosses are on his side regarding the extension of his contract.
Hamilton now leads Vettel by 17 points in the drivers' standings, with Bottas in third place, 20 points behind the Ferrari.
"Honestly I think Monaco is going to be hard for us", he said after Sunday's race.
On the face of it, Lewis Hamilton not only won in Barcelona - his second victory on the trot - but thrashed the opposition, pulling the trousers down of not only his team-mate Valtteri Bottas, whom he beat by over twenty-seconds, but his title-rival Sebastian Vettel, too.
Vettel finished fourth in the Spanish GP, having made one more stop than the three drivers ahead, and insisted post-race that emulating their one-stop strategies was "not an option". After that I was really surprised they didn't have the pace to keep up with me. "It's a good feeling".
Hamilton won from pole, unchallenged by the rest of the grid.
Kane challenges Salah to prove he's no one-season wonder
We have to see how we're going to perform. "Cool, then he has two weeks to prepare for our biggest game so far, that's for sure". Mohamed Salah has hailed the influence of Liverpool manager Jurgen Klopp as he wraps up a sensational season at the club.
"I only said that we are loyal first of all to our drivers". "We knew that we had a strong vehicle with a lot of pace and I think that we were quicker, but it is so hard to overtake here at this track". He has some serious records.
The Briton went on to miss out on the podium in four of the next six outings before eventually hitting his stride fully at Spa - a race that marked the beginning of a title-clinching run of five wins in six.
"It's going to be hard".
"This weekend we got ourselves on the right path", Hamilton said.
Vettel suspects it could be because of the tyre compound thickness, which Pirelli changed for this race to reduce the risk of blistering. "I would like to hope it could be part of the turning point". The Red Bull cars of Verstappen and Ricciardo kept out of trouble just behind them.
The Haas F1 Team has started 2018 with a cracking little vehicle, as demonstrated by Kevin Magnussen who finished sixth in Barcelona. The only glitch for Mercedes was when Sebastian Vettel managed to slipstream past Bottas for second place into turn 1.
"I was pushing every single lap using it as a test bench to understand what I liked about the balance and how can I play with it more and how can I squeeze more out of it and do all sorts to understand what more I can get from". He lost time in the pits and came back onto the track behind Verstappen, and was unable to make up the difference despite the newer tyres. "People probably think it was an easy race, that I was cruising".
"I never believed we can do a one-stop", he said.
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