The former Auxerre ace admits he is flattered that Manchester United legend Keane is keen to bring him to Wearside.
"Of course it's flattering that such a legend would like me to play in his team," Tainio told Ilta Sanomat.
"Sunderland and Tottenham agreed to the transfer for the common interest and Sunderland would be an interesting option.
"The first impression was good but the transfer still has a course to run. My negotiations are still taking place.
"Sunderland have a great stadium as well as tremendous fans.
"I understand they are interested in playing me in the centre of midfield."