Chelsea are under pressure to complete the transfer of Timo Werner what with his £50million release clause expiring on Monday.
Frank Lampard's side beat Liverpool to the signing of the RB Leipzig star after the Reds pulled out of the running, and are in advanced negotiations with the forward.
Chelsea were hoping to sign the Germany international this week, but the coronavirus pandemic has caused unforeseen problems.
Werner is unable to simply board a flight to England to complete a medical at Chelsea's Cobham training base, undergo the various procedures and put pen to paper on a contract.