He is now almost certain to make the final 23-man selection for the trip to South Africa.
"The FA got in touch and asked if I would have a rethink, due to injury problems. I said I would make myself available," the 32-year-old told liverpoolfc.tv.
"The World Cup and Champions League are the highest levels of football.
"I'm not getting any younger, we have no Champions League football next season and I am keen to work under Fabio Capello."