Seaman said, "Just because he cost a lot of money does not mean he goes straight into the team.
"He has to be patient. Petr Cech has done nothing wrong in goal.
"Ok, so he is adjusting to playing with the ball from the box. But he has been able to contribute to the team and has done nothing to cause him to be left out."
Seaman believes a spell in a more observational role will benefit Leno as he watches at first hand the demands of the Premier League.
"This could be a learning curve for him. You have to be patient in football... I know. I had to be in the past when I was playing. Leno has to bide his time."