We had already beaten them three times that season.
The Wales global has missed the last three games with a groin injury but Arsenal boss Arsene Wenger is confident he will now be ready to be involved at Wembley.
City confidence will be shaken and Wenger will know just how they are feeling. "But it's the league title and the (lack of) challenge for the league title that people are becoming frustrated with".
Guardiola has a decision to make at left-back as Fabian Delph is suspended following his sending off against Wigan while Benjamin Mendy is still recovering from a serious knee injury.
He came close in 2007 and 2011, losing surprisingly to Birmingham in the latter final when it was his Arsenal who were widely-expected to lift the trophy. If they can not, Wenger will be ready to exploit any weakness. No matter how many finals you've played in your life, it's always a special day.
For a second successive major cup final, Petr Cech will be among the Arsenal substitutes, with David Ospina starting in goal.
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Asked what recent success says about his team's mentality, the 68-year-old replied: "What it means is that you have enough belief to think you can do it".
During our Double season, Alex Manninger came in for six games to replace the injured David Seaman and kept a clean sheet in each.
"I'm happy with the way I've been playing and happy to be back", he added.
Now it seems the League Cup and FA Cup carry so much more weight for the Gunners that they can be lumped together and celebrated as a very real achievement.
By the time Arsenal kick off on Sunday they could be 11 points behind the top four and 10 behind north London rivals Tottenham Hotspur.
He acknowledged the threat from City standout Kevin de Bruyne but ruled out man-marking the Belgian. "At Wigan we could have played two up front in the last minutes if Gabriel had been on the bench - now we have that chance with Gabriel". De Bruyne and David Silva can not be given any space to work their magic.