The club legend is still confident the decision to appoint the Scot as Sir Alex Ferguson's successor was the correct one, and feels victory in the derby could be a turning pointManchester United legend Sir Bobby Charlton is "absolutely certain" David Moyes was the right choice to succeed Sir Alex Ferguson.
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United face Manchester City on Tuesday with the champions looking unlikely to secure a top four finish, but Charlton's faith in the decision to appoint Moyes remains unwavered.
"It doesn't mean we are going to change everything. I'm absolutely certain that we picked the right man," he told BBC Sport.
City triumphed 4-1 over United in Moyes' first Manchester derby earlier in the season and Charlton feels victory over the cross-city rivals will prove to be a huge confidence boost ahead into the final few weeks of the season.
He continued: "We are trying our best to make sure that we can beat them. If we can, it will be a tremendous stride because we've had a bit of criticism leading up to this, but I never doubt Manchester United."