The Reds are looking to sign a quality striker prior to the Asian Champions League which kicks off on February 23 and the Dutchman has been closely linked with a short-term move to Hindmarsh Stadium.
The deal hinges on the clubs interim caretakers, Football Federation Australia, signing off on a six-month deal and Adelaide football director Michael Petrillo said they are no closer to a deal today than when they were at the beginning of the week but are very hopeful.
"We're still looking at two or three players to fill a striker's spot," Petrillo said. "We've got until February 17 to select our final squad.
"We haven't made contact with the Roar yet (regarding van Dijk).
"We hope to have some news in two or three days."
If the deal goes ahead, it is likely that van Dijk will then join Sydney FC on a permanent deal once his Asian Champions League duties with the Reds are completed.
Adelaide have also been linked with Australian striker Michael Baird who is currently tied to Romanian club Unversitatea Craiova but Petrillo ruled out a move due to his contract obligations with the club he joined in 2006.