Villa were thrashed 8-0 at Chelsea on Saturday before going down 4-0 at home to Tottenham on Boxing Day.
Those defeats leave the club just three points and two places above the drop-zone going into Saturday's home game with fellow-strugglers Wigan but Lambert remains upbeat.
"I believe they will do it. There is no pressure on these lads at all. They will go again and give us everything," he said.
"Even though people got carried away before about us beating Norwich and Liverpool, I never did and neither did the team.
"We never let them get too high or too low, because the nature of football is that you can get hurt at any moment.
"We had a good chat the other day with them. For a lot of them, this is their first crack at Premier League football.
"It is not just the defence - it is everywhere. It is unfair to criticise the defence. We are in this together, and collectively we have to stop this, not just the defenders."