Midfielder left disappointed by late goal.
Jack Colback admitted West Ham's late equaliser was tough to take after Sunderland picked up a point at West Ham.
Steven Fletcher's ninth-minute opener looked to have secured victory for the Black Cats, who defended manfully under heavy Hammers pressure.
The line held until deep into injury time when United captain Kevin Nolan squeezed home a shot from close range to ensure the spoils were shared.
If we had taken our chances that would have killed the game off, but at 1-0 there's always a chance of an equaliser
- Jack Colback
“It's a kick in the teeth to concede at the end because we defended fantastically throughout the game,” Colback said.
“Sheasy [John O'Shea] and Titus [Bramble] were brilliant and we coped with everything they threw at us. To then concede at the end is a bitter pill to swallow.”
He added: “If we had taken our chances that would have killed the game off, but at 1-0 there's always a chance of an equaliser and it's disappointing that they managed to get the goal.”
Meanwhile Colback reserved praise for team-mate Fletcher after the striker netted his fourth goal in three league appearances.
The Scottish international has now scored in three successive games and gave Sunderland the lead with a crisp drive after pulling down Seb Larsson's clipped cross.
“He always makes the most of his chances and it was a good goal,” Colback said.
“Fletch's first touch was spot on and he finished it well. In the Barclays Premier League it's hard to score so it's great to know we have a player of his calibre.“If you give Fletch the right service you know he's going to finish the chances off.”