The Spanish champions notched up a 2-0 win in the first leg and although they have dropped four points behind leaders Real Madrid in La Liga, Mascherano feels that no one should doubt their winning mentality.
"We have shown over the past five or six years that we have not lost our appetite and we have continued to win trophies. So far this season we have won the (domestic) Super Cup and we are still fighting in three competitions," the Argentine defender said.
"We now have an advantage but what we need to do is to make the most of that and continue to play our own style which is what we've shown over the years. We have faith in ourselves and need to be true to our style,” he said.
"Manchester City normally play an attacking style and I expect them to go out with a lot of forwards now. I know (Sergio) Aguero, I would say he is one of the top five forwards in the world," he added.
"Given the space he can destroy you so we will try and make sure that he has as little space as possible. If you do that then you can make it uncomfortable even for even the best players," he added.
Barca have reached at least the Champions League semi-finals in the last six seasons and it is likely to take something special from City to turn around the tie at the Nou Camp.


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