Cahill, John Terry and Petr Cech once again proved impassable as the Blues kept another clean sheet in Saturday's Barclays Premier League game at the Emirates Stadium.
Less than three days after denying Lionel Messi and his Barca team-mates a goal in Wednesday night's Champions League semi-final first leg win, Cahill helped manage to thwart one of the world's other great forwards in Robin van Persie.
The defender said: "It was great practice, coming up against the likes of Robin van Persie, who's in form this season, and is one of the best forwards in the world at the minute.
"It doesn't get any harder, does it, this week, facing the likes of Messi and then Van Persie and then back to Messi and the boys?
"So to keep two clean sheets in the two games we've just played is pleasing for us as a whole team."
Keeping clean sheets is something Chelsea have been accustomed to again since Cahill and Terry finally translated the partnership forged with England to club level.
The pair have conceded just one goal in the five matches they have started together and have yet to lose in any of the eight games in which both have played a part.
It is the kind of solidity Chelsea have arguably lacked since selling Ricardo Carvalho.
However, the biggest test of that will come at the Nou Camp.
Cahill said: "I think we require similar to the home leg: a little element of luck; defensively as a whole unit everyone sticking to their task; and the concentration level.
"The other night, I think physically I've run more in games, but the concentration level had to be unbelievably high and that's what all the lads did.
"So we need that again."
Cahill will be one only a few Chelsea players never to have played at the near-100,000-seater home of the European champions.
"Obviously, I haven't played there yet, but the lads tell me that the pitch is massive," he said.
"It's tough because obviously there'll be a lot of space there and fantastic players filling it.
"We know how tough it's going to be but we go there to give it our all and with a good start."
The current run of games is exactly why Cahill decided to trade a relegation dogfight with Bolton for a January move to Stamford Bridge.
He said: "First of all, you want to be at a big club. Then, when you're there, you want to play as massive part in it.
"So to play a part in what's been a great week and, really, a great couple of months result-wise is pleasing."
It will all be for nothing, of course, if Chelsea fail to win one of the Champions League and FA Cup and finish outside of the Premier League top four.
Caretaker manager Roberto Di Matteo yesterday hit out at the "crazy" schedule that could cost his side dearly.
He was forced to make eight changes on Saturday and watched the Blues slip four points behind fourth-placed Newcastle with only four game remaining.
Had Fernando Torres, Daniel Sturridge and Salomon Kalou been more clinical in the final third, those changes would have been completely vindicated.
Cahill said: "It's important to get some fresh legs out there and the lads that came in did really well.
"People come in but it's the same Chelsea, the same sort of way that we've been playing and we take the momentum in getting another result.
"Obviously, three points would have been tremendous for us, but coming to Arsenal and taking a point, you've got to take the positives from that."