"I didn't really worry too much about the money that was involved, I have to say.
"He is a young 'keeper, he still has a hell of a lot to do, he is still improving all the time, and the experience he is having with Scotland will do him the world of good."
Gordon will be a central figure in any fight to turn things around at the Stadium of Light, and Keane, who was privileged to line up in front of Manchester United legend Peter Schmeichel during their time together at Old Trafford, is convinced there is much more to come from him.
He said: "You try not to get too carried away with a player, especially at my club. I have got to try to keep his feet on the ground.
"But you talk about keepers maturing as they get older and reaching their peaks at a lot older than outfield players.
"We are just hopeful there is a lot more to come from him, which is fantastic for him and for us."