In 2017, Valtteri Bottas finished fourth and Lewis Hamilton seventh, with the latter starting only 14th after a difficult Q2 session.
"Bloody worried," said Wolff when asked for his thoughts on the upcoming street race.
"We've seen in the last years that there were always tracks that suited us well, and some that we weren't perfect, for whatever reason.
"It's very difficult to undo the DNA of a car, and Monaco, Budapest, Singapore, were all tracks where we underperformed – underperformed a lot – last year.
"It's a great challenge for us to come back this year, tame the 'diva' - it's not a diva this year, actually, she's behaving better.
"It's a difficult one. Why our car doesn't like to be quick around the corners in Monaco, we haven't found out yet."
Hamilton believes that Monaco mi