Arsenal manager Arsene Wenger praised his team's resilience after they hit back from a goal down to beat West Ham United 3-1, but also admitted that they worry him.
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After dominating the first half at Upton Park, Arsenal fell behind to a goal from Carlton Cole, but fought back through a Theo Walcott brace and a strike from Lukas Podolski.
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"I have confidence in the team, but I also worry," Wenger said. "That is the nature of the game. You always worry.
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"I am proud of the character of this team because they are always focused and try to do well. They respond, but football is football."
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Arsenal's response, when their heads might have dropped, suggested that they are made of sterner stuff this season than in some previous Premier League campaigns.
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"We couldn't take our chances in the first half and we responded very well in the second half, in the end winning the game in a convincing way," Wenger said.
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"The positive is we created chances. The negative is we didn't take them. Sometimes there is a guilt flying around the team when you don't take your chances. You think, basically, we deserve to be punished, and we were."
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One negative for Wenger was an injury sustained by Aaron Ramsey, one of the few players this season who has looked like giving Liverpool's Luis Suarez a run for his money in the Footballer of the Year voting.
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"It looks like a thigh strain," Wenger said.
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"For me, a thigh strain – I don't know how serious the thigh strain is – but the Christmas period is certainly over for him. It was his (23rd) birthday today (Thursday)."
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But a big plus for Wenger was the return from a hamstring injury of Podolski.
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The German attacker replaced Ramsey after 66 minutes and provided the left-wing cross from which Walcott headed in his second goal of the game, in the 71st minute, before scoring the third himself.
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"He has been out for four months, he has not played one game," Wenger said.
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"I try to get him slowly back to competitiveness and he has shown that he can have a huge impact because he can score and make you score goals, give assists."
The fightback was one I did not expect. West Ham's defence just wasn't good enough. Good job Arsenal.
The game against Newcastle is an important so his boys must nt flop throughout 90 minutes
They just have to get all three points against Newcastle in tomorrow's game. Which will be very difficult.
And they've won today's game against Newcastle again so Arsenal is a team to watch out for. Gud goal from Giroud.