"It's not just a one-off game, we've come from behind like that quite a bit this season," said Carragher.
"It's something Manchester United have done a lot in the past to win titles and you've got to take your hat off to them because they've done it over the years and this season as well.
"It's something we've not been too good at in recent years but we seem to have it in our locker this season and hopefully that will push us as close to the title as possible.
"There's nothing better when you think you're going to lose a game and you come back and win - it knocks the stuffing out of the opposition and you just want the referee to blow the final whistle as soon as that goal goes in.
"We still had to defend a few high balls into the box [at Fratton Park] but you've got to keep your emotions in check. You're so excited but you realise that the game still hasn't finished. But we were delighted when we got back in the dressing room."