Willian is expected to miss Chelsea's Premier League clash with champions Leicester on Saturday on compassionate leave following the death of his mother.
The Brazil playmaker wrote a poem in his native Portuguese in tribute to his mother on Instagram on Thursday after her death, reportedly of cancer.
"All of us at Chelsea Football Club are sending our love and deepest condolences to Willian and his family after the passing of his mother. We are thinking of you Willian," read a club statement.
Willian scored in Brazil's 2-0 win in Venezuela on Tuesday night.