The Ghanaian netted the only goal of the game after 77 minutes when Milan Baros was felled inside the area by Tomasz Kuszczak, who was sent off in the process.

The goal came against the run of play as the Red Devils had been in total control of the Old Trafford encounter.

United had to play the last ten minutes with Rio Ferdinand in goal as Sir Alex Ferguson had no more substitutions to make after Kuszczak's expulsion.

Pompey's first Old Trafford victory in as many years means that Harry Redknapp's team have reached the FA Cup semis.