Albion revealed they have rejected several bids for the 30-year-old, Cardiff and Nottingham Forest have also been interested, but Gregan's number one choice is understood to be a move to West Yorkshire.
"Sean Gregan is a player we are interested in and is being linked with Leeds United for the right reasons," said Kevin Blackwell. "He is keen to come to Leeds and he's the type of player I believe will be a major addition. He commands midfield and is very comfortable on the ball."