Brian O'Driscoll says the British and Irish Lions must dig deep following their narrow defeat to Australia in Melbourne.
O'Driscoll's opposite number Adam Ashley-Cooper scored the game's only try on 75 minutes with Christian Leali'ifano landing a crucial conversion to snatch a 16-15 win.
"Obviously we're very disappointed," said O'Driscoll. "We were ahead on the leaderboard, we got six points clear, that's a horrible margin; a converted try and you're behind.
"They battled away and, we were a bit loose with aspects of our game and gave them opportunities to build the platform to get their score."
O'Driscoll says the Lions must regroup ahead of next weekend's Test decider against the Wallabies in Sydney and is confident they can still win the series.
"It's not over," the Ireland centre stated. "We've got one massive week next week, both from a mental point of view and a physical point of view to get ourselves right for Saturday in Sydney.
"We knew it was never going to come easy and they made it tough on us."
He added: "It's huge, the momentum from this game is with them but we won't let that phase us, we'll dig deep.
"We were able to beat them once and there's no reason why we shouldn't be able to do it again if we can get our game right."
Who was your man of the match in Melbourne?