The Citizens were beaten 3-1 at Ajax on Wednesday night, all-but ending their hopes of progressing from the Champions League group stage.
The former Wolves man was beaten to the ball by Niklas Moisander for the Eredivisie champions' second goal, and has highlighted a deficiency at the back, compared to last season.
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Lescott told reporters: "It is one of those things. Last season we were scoring at will and not conceding many goals. We got a lot of plaudits so, rightly so, we are in for criticism now because we are conceding more goals.
"As a team we are not overly enthusiastic with the way things are going but we are getting there.
"It is a slowish start for us this season but we are still in the top three of the Premier League and we are still in with a chance of qualifying for the knockout stages of the Champions League."
Lescott insisted that City have enough quality to pick their season up, and has issued a rallying call for the players to show unity as they hunt Chelsea down at the top of the Premier League table..
The 30-year-old added: "On paper it looks great, but paper doesn't win games does it?
"We need to put it in. We win and lose together.
"Obviously the opposition is of a great standard, so we know there are no easy games, but we go into each game confident we can achieve something and play our way."