Barry expects a backlash from fans over England's World Cup flop.
"The team as a whole need to earn the right to get the supporters back behind them," he told the Daily Mail. "The whole nation was disappointed in the summer and there will be all sorts of excuses and reasons why we didn't do better. But as a team we need to get together behind the manager and rebuild the faith of the fans.
"The qualifying games (for Euro 2012) start straight away and we need that support, so hopefully they will be behind us.
"Yes, there will be a sense of trepidation before we go out. You have seen the fans boo individual players before when anything has happened. That is just football these days. But I think the general public will get behind us. The fans are English, the players are English. We all want the same thing.
"Hopefully, from the first friendly to the end of the qualifiers the nation will get back together."