The Blues travel to the Camp Nou on Wednesday aiming to beat the odds and defeat the Catalan giants on their own patch to secure a place in the quarter-finals of the Champions League.
The tie is level at 1-1 from the first leg at Stamford Bridge so the Londoners could also progress on away goals if they draw by scoring two goals or more.
However, Barca are undefeated in 28 Spanish La Liga games this season while they have not lost on home soil in any completion since last August.
Therefore, it represents a tall order for Chelsea to come out on top, but Cahill is adamant they are looking forward to the game and punters may decide to use their free bet to back Antonio Conte’s side to qualify for the last-eight.
‘Chelsea are being written off but it is the nature of the beast,’ the London Evening Standard quotes him as saying. ‘If you’re looking at facts, this club has been very, very successful over the last 10 years, and since I have been here over the past six years.
‘You can have ups and downs. I can speak about myself and when I have been down I have bounced back. The same goes for the club. Let’s go there with confidence we can put in a good show and do the best we possibly can to get through to the next round.
‘It’s poised nicely. We’ve got one game to try to go through against world-class opposition. We know it’s going to be tough but we’re ready for the challenge.’
Burnley are believed to be leading the chase to sign West Brom defender Craig Dawson in the summer transfer window.
Stoke could face a battle to keep Xherdan Shaqiri as reports have claimed Mark Hughes wants him at Southampton next season.
Bayern Munich have entered the race to Emre Can, who continues to talk up a move away from Liverpool this summer.