Frank Lampard admits it is now "crucial" England overcome Algeria on Friday after they were held 1-1 by the USA in their World Cup opener.[LNB] Robert Green allowed a low 25-yard shot from United States midfielder Clint Dempsey to slip out of his hands and over the goal-line for the equaliser in Saturday's 1-1 draw in Rustenburg.[LNB]With Slovenia overcoming Algeria yesterday to go top of the group, Lampard is aware England cannot afford any more slip-ups in Cape Town after skipper Steven Gerrard's early goal was cancelled out.[LNB]England's vice-captain said: "It's crucial to win the next game. To win against the USA would have put us in the driving seat but we have to believe in ourselves.[LNB]"It was the first game - and first games are notoriously cagey. They all have been like that so far in the tournament and we were just unlucky with the goal.[LNB]"It felt very comfortable at 1-0. We had got the goal, were knocking the ball about well, were in control.[LNB]"It was unfortunate and it was frustrating. Their goal came at a good time for them.[LNB]"If they hadn't have scored when they did, then I'm sure we would have gone on to win the game.[LNB]"But that's the way it was and we know there is room for improvement still."[LNB]Lampard insists Green has the support of the players and he showed his character with a crucial second half save to deny Jozy Altidore a shock winner.[LNB]The Chelsea midfielder said: "I didn't need to say much, just 'keep your chin up.'[LNB]"We need to stay together as a group and we all make mistakes and unfortunately as a keeper you are the last line.[LNB]"The ball moved about a bit. Greeny would be a bit disappointed but he did make a very good save second half.[LNB]"You have to support your team-mates, we are a group and we need to stay together.[LNB]"We've all been in positions in a game where you don't want to let your chin drop and I think Greeny did that."[LNB]Capello has now to decide whether to show faith in Green, who has started nine of the last 12 internationals, or recall either David James or Joe Hart.