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Theissen said the two teams are extremely close in terms of pace.
"Our pace was okay - I don't know if Ferrari had something in their pocket. If not, the three teams at the top have certainly come closer together.
"It was close. Due to the start, Robert went behind Lewis into the first corner and he went behind Lewis over the finish line, they both had the same pace and the same strategy, pitted on the same laps, so it's more than close."
He added: "Robert's car was not perfect as opposed to Nick's. initially, the start was very good and then he got some wheelspin under acceleration and we have to look into it – I don't know the reason behind it at the moment."