Johan Santana has company on the trade market. According to league sources, the A's, within the past couple days, have begun calling teams to seek interest in star pitcher Dan Haren, one of the better right-handers in the American League. One difference between Santana and Haren: The Twins are under pressure to deal Santana as he has a year to go before free agency, while the A's have Haren under a team-friendly contract that will pay him $16.25 million through 2010 assuming his $6.75 million option for 2010 is exercised. The A's have contacted at least the Mets, Yankees and Red Sox -- three teams that also have showed interest in Santana -- about Haren, who was 15-9 with a 3.07 ERA in 2007. The A's are thought to be seeking from the Red Sox center fielder Jacoby Ellsbury -- who's currently the sticking point in Boston's bid for Santana -- plus either of two top young pitchers, Clay Buchholz and Jon Lester. The A's also will consider offers for their other top pitchers, including Joe Blanton and Rich Harden. Oakland is believed to have its sights on one or more of the Yankees' three top young pitchers -- Joba Chamberlain, Phil Hughes and Ian Kennedy. From the Mets, among those expected to interest Oakland include pitchers Mike Pelfrey and Kevin Mulvey and outfielders Carlos Gomez, Fernando Martinez and perhaps Lastings Milledge.