Chelsea are unlikely to be able to sign Shakhtar Donetsk midfielder Willian until the summer, because of work permit difficulties.
The west London club are in negotiations with the Ukrainian giants after their first bid, alleged to be 16.5million, was rejected.
"As far as I know the negotiations between Shakhtar and Chelsea are still ongoing," assistant manager Alexandru Spiridon said.
"Willian asked to go back to Brazil, because his wife is pregnant now.
"I think the transfer fee offered by Chelsea does not match Willian's skill.
"You probably know from the internet that Eden Hazards transfer value is 30m. Chelsea offered 16.5m for Willian.
"I do not think that Willian is weaker than Hazard, and in some components he is even stronger."
Willian has only made two appearances for Brazil, which is a long way from meeting the work permit criteria.
If he made more starting appearances for the five-time world Champions over the next six months it will make it easier for the Blues to argue his case, meaning the deal might have to go on hold until the summer.