Speaking to the Official Club Website, Keane said: "It's obviously a very sad day with the news of Sir Bobby.
"I think it was nice that we had a game tonight though because it gave the supporters a chance to show their appreciation for Sir Bobby.
"It was a night of celebration in some ways and I said to the players before the game that I wanted them to go out and pay their respects by putting in a good performance and play the way Sir Bobby liked the game played. I think they did that.
"I was lucky enough to have met him on a couple of occasions. He came to the training ground when I was manager at Sunderland and apart from obviously being a fantastic manager, he struck me as a true gentleman as well."