By Chris Harris

Theo Walcott believes Arsenal must stay on the "front foot" to have a chance of beating Barcelona on Tuesday night.

No one was more positive than the England international during last week's 2-2 draw at Emirates Stadium. Walcott came off the bench in the 66th minute, scored three minutes later, played a part in Arsenal's equaliser and rocked Barcelona with his pace and directness.

It remains to be seen whether the 21-year-old has done enough to earn a starting place as Arsène Wenger's men brace themselves for the second leg but, either way, Walcott is urging his team-mates to impose their own game on Barcelona at the Nou Camp.

"We have got to believe we can come here and get a result, there is no point playing within ourselves, we have all got to be at it," he said.

"As a winger, an attacking player, you always have to be on the front foot. Hopefully I can get at them and will give them a problem. However, it is not just me, we have got 10 other players out there, but if I can create space for some of the others, then that is all part of my job.

"It is a nice thing to have people saying good things [about me] - I just have to do it on the pitch."

The evidence seems to be stacking up against Arsenal ahead of the ultimate test of their Champions League credentials. Barcelona have the luxury of two away goals, they could and perhaps should have scored more in a first-half masterclass at the Emirates and they face an Arsenal side shorn of key men like Cesc Fabregas, William Gallas and Andrey Arshavin.

But Walcott saw a chink in Barca's armour last week and he thinks Arsenal can exploit that on Tuesday night.

"Barcelona at times played some fantastic football, and was some of the best I have even seen a team play in the first half," he said.

"However, they seemed to die off a bit in the last 20 minutes and if we can keep it at 0-0, or sneak an early goal, hopefully we can upset the fans, keep them all quiet.

"We have scored a lot of late goals this season, especially in the Premier League, so hopefully we can believe and can do it again.

"There are some big players missing, but players will come in and do a job. We just have to work 100 per cent, that is all we can do."

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 5 Apr 2010