According to Ken Rosenthal, "virtually every club with a need at the position has expressed interest." He also had this to say that the Yankees do expect him to have a much better 2009, and thought Cano "tried to hard this season to justify his new four-year, $30 million contract."
He's still a very good young second baseman, he's not too expensive, and he's locked up until 2011. So they could certainly get something good in return, but like I said yesterday I would only want to trade him for a top of the rotation starting pitcher.
MLB Trade Rumors goes over all the possible suitors for Cano.