Manchester City midfielder reveals his fitness should be 'spot on'.
The Manchester City man was left out of Fabio Capello's line-up for the 1-1 draw with the USA on Saturday but Barry is adamant that he should be "spot on" with regards to his fitness come the crucial clash against Rabah Saadane's side later this week.
"The ankle has been fine for 10 days," he told BBC Sport.
"Another week's training in the lead-up to the Algeria game and I should be spot on.
"If the manager had asked me if I was ready to play against the United States at the weekend, I would have bitten his hand off to try and make the starting team.
"I was desperate for us to go two or three goals up and then he might have thrown me on!"
The former Aston Villa star traveled to South Africa for what is his first World Cup having been snubbed by Sven-Goran Eriksson in 2002 and 2006 and Barry admits his England career looked "miles away" under the Swede at one point.
"It has felt like the World Cup was never going to come for me," he added.
"Midway through the Sven-Goran Eriksson era, my England career and the World Cup looked miles away.
"When the injury came, it felt like it was one of those things, that it [the World Cup] was not going to happen. But it was important I never stopped believing."
Barry went on to reveal that he was booked into an oxygen chamber every morning in an attempt to get his ankle right for this summer's World Cup.
"We had a few hot days in England and the tent was tough to sleep in with the heat," he continued.
"Every morning they were booking me into an oxygen chamber for an hour and a half, getting that in the lungs. They say that speeds up the process of healing.
"All these things and the treatment they gave me probably got me ahead of where I should have been.
"But it was always touch and go whether I could make the squad. I hadn't spoken to anybody from the management staff here.
"Reports you read in the paper, you never know how true they are. In some quarters they were writing me off as though they knew more than I did. I was nervous waiting for a phone call.
"Eventually Franco Baldini called me and wanted to hear from me how I felt and if I really felt I had a good chance.
"Probably even if I didn't, I'd have still told him I did. I tried to be up front and tell him how it was and at that stage I was confident.
"It was a really tough few weeks sitting at home every day, and I couldn't do much. Eventually I was happy to make it."