Borg had trained for four months for the tournament in Liverpool

The Swedish tennis legend was due to turn out in the Liverpool International Tennis Tournament at Calderstones Park on 15 June in a match against Pat Cash.

But, after receiving medical treatment, Borg has been advised not to put any weight on his leg for three weeks.

Tournament organisers said Bjorg will still be appearing to greet the crowds.

"I'm so disappointed that I cannot play," said Borg. "I've been really looking forward to this event and have been practising hard for four months to get ready."

Organiser Anders Borg, who said the German shepherd dog that attacked his namesake is called Wolf, added: "This kind of thing is hard to take, but when they do happen we just have to deal with it

"It is a big blow but I am glad he will still appear and honour his commitments."

Richard Krajicek, the 1996 Wimbledon champion has been signed up to replace Borg.

Organisers confirmed supporters will not be able to get a refund, though they will be given priority when it comes to buying tickets for next year's event.