Jul 12, 2009 11:15 AM EST

The Yankees have inquired about Roy Halladay, but the Blue Jays appear to be asking for too much - including either Joba Chamberlain or Phil Hughes.

New York could offer outfielder Austin Jackson and catcher Austin Romine, two of the club's top prospects, but Toronto will certainly demand a top arm as well.

"They are kicking the tires, but they don't have enough," said a source.

The Red Sox, Brewers, Cardinals, Phillies and Yankees are believed to be the five teams most interested in Halladay.

Via New York Post