The Scot has insisted that he had no qualms about bringing in the former Manchester United midfielder, which could have potentially put his future in doubt.
"It never once crossed my mind," Lambert told reporters. "The two of us are really strong characters.
"I knew he had a lot of football knowledge that was unfairly tarnished. His knowledge meant he was too good to be a television pundit. To get him back in the game was great."
Lambert signed a new four-year contract with Villa following their excellent start to the Premier League season.