Reds defender Joel Matip spoke after Liverpool's 2-3 defeat to West Brom at Anfield on Monday night.
Alan Pardew's side claimed a 3-2 win in an eventful clash at Anfield, ensuring Liverpool failed to progress beyond the fourth round of the competition for the third year in a row.
Roberto Firmino opened the scoring but a double from Jay Rodriguez turned the game on its head, before a third Baggies goal was disallowed and a Liverpool penalty awarded through VAR, only for Firmino to miss from 12 yards.
Joel Matip's own goal at the end of the first half ultimately proved decisive, with Mohamed Salah's 78th-minute strike coming too late to spark a comeback.
Watch Matip's reaction as he admits he made an error for West Brom's final goal.