Liverpool Vision is hoping to line up a special performance in Shanghai from a Merseyside rock legend to help promote the city in October.
Mike Taylor, director of investment and enterprise for Liverpool Vision, said: "We are still waiting for confirmation from Elvis Costello's management team to see if he can perform at a special Liverpool Day concert in Shanghai on 16 October. We already have a performance arranged with the Royal Liverpool Philharmonic Orchestra on the day. Both Elvis Costello and the RLPO are important to the cultural essence of the city."
London-born Costello, real name Declan Patrick MacManus, was christened in Birkenhead and finished his school days in Liverpool, has in past talked about his passion for the city.
He recently announced his only UK appearance ahead of his world tour this year will be in Liverpool at the Philharmonic Hall in June.
Liverpool's participation in the World Expo is being led by Liverpool Vision in partnership with the North West Development Agency, Liverpool City Council and the Liverpool-Shanghai Partnership.
The World Expo runs between 1 May and 31 October and is expected to attract around 70 million visitors during the six months.
Vision and its partners launched two videos yesterday which gave an insight into how the £1.1m Liverpool Pavilion will look, as well as a taster of a specially commissioned promotional film created by River Media.