Sir Alex Ferguson was left disappointed Manchester United only won by a solitary goal following the 2-1 victory over Liverpool at Old Trafford.
Wayne Rooney's brace in the opening five minutes of the second half had United cruising towards the top of the Premier League table following a lifeless Liverpool display.
However, Luis Suarez pulled a goal back with 10 minutes to go and Ferguson felt his side had been too comfortable after going in front.
"I was disappointed it's ended up 2-1," the United boss told Sky Sports.
"Maybe we did tend to just try and play out the game, keep possession and not really threaten in the way we did before we got the goal.
"That's the only fault I can find with the players because right through the team they played some fantastic football."
United might have taken the lead in the first half, but veteran midfielder Paul Scholes' header was well saved by goalkeeper Jose Reina.
Ferguson added: "I thought Danny Welbeck was terrific, particularly in the first half. Scholesy was unlucky with his header, the goalkeeper had a good save.
"I thought we were really well on top of the game. It's just getting that goal and of course Wayne has scored and then two minutes later scored another one which was a great start to the second half for us."
Suarez halved the deficit 10 minutes from time and Ferguson admitted it was a nervous wait for the final whistle.
"Oh crikey me, I think my heart's still out there," he said.
"It was nervy in the sense you were playing Liverpool and they've come back from 2-0 down to 2-1 and you know football, anything can happen."