Brazilian global Willian has failed to return to Chelsea for pre-season with rumours of a move to Real Madrid continuing to swirl.

With world's best three midfielders, Kroos, Modric, and Casemiro available in the squad and moreover Marco Asensio struggling for a permanent place in Los Blancos XI, Mateo Kovacic may get very few chances at Real Madrid next term.

Yet the Brazilian has insisted he is happy at Chelsea.

Which makes reports that he failed to report back to the club for pre-season training on the expected date all the more odd.

But he has yet to appear at training as the new season approaches.

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The Times reports that the Willian has been struggling with passport issues, but his absence has raised some eyebrows back at Stamford Bridge.

Yet some at Chelsea are not convinced that the winger is telling the truth. However, the club are reported to be skeptical given the situation which unfolded last season when Atletico Madrid-bound Diego Costa also failed to return.

The report also claimed that Chelsea's sources are anxious that Willian's situation is very similar to what Diego Costa told them last summer before demanding a move away.

Should Willian leave the South-West London club they would surely have to dip into the transfer market once again as they do not possess a replacement out-and-out winger.

According Spanish media outlet, Sport, Chelsea will offer Willian a new deal with new boss Maurizio Sarri keen to keep hold of their man.