Seven-time singles champion Williams will play at the All England Club for the first time in four years.

The Serbian alleged in an interview that food he was served in Melbourne led to him having high levels of lead and mercury.

Djokovic is recovering from knee surgery to repair an injury sustained at the French Open earlier this month.

Djokovic underwent an MRI scan on Tuesday which revealed a torn medial meniscus in his right knee and forced him to withdraw from the tournament.

Djokovic has endured a turbulent build-up to the tournament.