But the moment they did it was ruthless as striker Aguero converted 20 minutes from time.
There was some intricate build-up play and Gabriel Jesus twice found the Brighton net only for the strikes to be ruled out, once for handball and once for offside.
The Brazilian also had a point-blank header saved by Ryan before City’s late burst.
Twenty years after facing extinction and following a 34-year absence from the top flight, Brighton are a Premier League club.
Jesus went close on more than one occasion (Getty)
The Seagulls had more recent history with City, knocking them out of the League Cup on penalties at the Withdean Stadium.
That was in September 2008, in the early days of City’s Abu Dhabi ownership, which bank-rolled the signing of five players for £200million this summer.
Guardiola, who hopes the lavish expenditure will be a one off, fielded three of his new boys from the start.
Walker was named Man of the Match on his City debut (Getty)
City, as expected, dominated possession and hemmed Brighton into their own half.
City had the ball in Brighton’s net after 27 minutes, but it was…