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Williams made her return to the WTA Tour alongside Mboko in the doubles at Queen's earlier this week.

After nearly four years ‌away, the 44 year-old helped Mboko beat Nicole ‌Melichar-Martinez and Erin Routliffe.

However, Mboko sustained a nasty injury during her singles clash against Karolina Pliskova.

The 19 year-old was subsequently forced to withdraw, meaning Williams has had to pull out.

Williams, who has won 23 grand slam titles, is set to compete at the Berlin Open next week and could yet feature at Wimbledon.