Manuel Pellegrini's side ran out comfortable winners at the Stadium of Light on Tuesday, with the two big-money summer signings joining the Argentine on the scoresheet.
Manchester City ran out the 4-1 winner over Sunderland in the League Cup on Tuesday, with summer signing Kevin De Bruyne on the scoresheet for Manuel Pellegrini's side.
The struggling host was outclassed by the Premier League leader, which was 4-0 up within 36 minutes, prompting a number of home fans to make an early exit from the Stadium of Light.
The result and, in particular, the manner of the performance, is likely to increase the pressure on Sunderland boss Dick Advocaat who admitted ahead of the game that he would step down if he felt someone better was ready to replace him.