Sunderland boss David Moyes was left to rue a controversial opening goal after seeing Southampton romp to a 4-0 Premier League victory at the Stadium of Light.
The Black Cats capitulated horribly after going 1-0 down on the half hour, eventually losing comfortably to the EFL Cup finalists.
However, Moyes insisted that the opener, which appeared to go in off striker Manolo Gabbiadini's arm, should not have been allowed by referee Paul Tierney.
The Scot said: "Actually, we had played well for 20, 25 minutes, maybe as well as we had played here this season at times without making enough opportunities.