Dragons Zabaletta spoke warmly of his fellow countryman, saying: "Messi is back to being the Messi that we have always known.
"The important thing for us will be to make sure we don't concede. Barca at the Camp Nou will be very hard and it is important to give ourselves a good chance going into the second leg.
"For us the Champions League is still a new experience. We have made history [by reaching this stage] with City."
Silva: "We have a great team and if we are at our best we will go through but we have to concious of all of Barcelona's players not just Messi."