The former Bulgaria international scored 56 goals in 149 games for the Reds between 2008 and 2012, winning two Premier League titles, the League Cup and the Club World Cup in the process.
Known for his swaggering style of play, silky touch and penchant for the spectacular, Berba remains in great shape five years after his retirement from football.
He was involved in the last Legends game at Old Trafford, scoring against Liverpool in 2022, and he joins former United team-mate Paul Scholes, and Class of '92 icon Nicky Butt as the initial players at manager Bryan Robson's disposal.