Reports have suggested that Jose Mourinho is not keen on bringing in the German international to Stamford Bridge despite Chelsea's long pursuit of the 22-year-old.
Schurrle was close to joining Chelsea last season, but the move did not go through as the two clubs did not agree over the personal terms in the deal.
Leverkusen general manager Rudi Voller remains confident that the transfer, thought to be worth a fee of £20million, will be completed soon.
"We will not react to something like that [reports that the deal is off]," said the former German international. "We are still working on the transfer. The last signatures are missing."
Schurrle's agent, Ingo Haspel, echoed Voller's words over his client.
He said: "I'd like to think that the deal will come off over the next couple of days."