Graham Roberts believes John Terry and Gary Cahill could be Chelsea's key men in the Nou Camp this evening.<br /><br />The Blues' defence is sure to be under intense pressure against Barcelona as the Catalans seek to overturn their 1-0 deficit from the first leg in London last week.<br /><br />But, having shut out Barca at Stamford Bridge, and followed that up with another clean sheet against Arsenal at the weekend, Roberts feels Chelsea's defensive solidity could prove decisive.<br /><br />BREAKING: Is this Chelsea's shocking new white kit for the Barca game?* http://bit.ly/Ilbkuv <br /><br />SUBSCRIBE to get more funny, strange and outright awesome football content delivered right to your news feed: http://bit.ly/Hu3sIN<br /><br />FOLLOW us on Twitter and tell us what else you want to watch on talkSPORT's YouTube channel: http://bit.ly/IiA1t2<br /><br />LIKE us on Facebook to join the world's most intriguing sporting debates: http://on.fb.me/HAm7Gn
