Gardner is convinced that the Ulsterman has already strengthened his hand in the striking department with the capture of Saha, who made his Barclays Premier League debut for the club as a substitute in Saturday's 0-0 draw at Arsenal, on a one-year deal.
"When Louis came on, I thought he was unbelievable. He held the ball up, was strong and that's what we needed," he said.
"Even in the changing room, it helps when you see someone who has been at Manchester United, and he's a top-class player and top-class person.
"He talks to you, tells you and encourages you, and that's what you need. If we can get a few more players in to go with his experience, that would be great."