In the last year of his contract, Morales is hitting .281 with an .807 OPS for the Mariners this season. Teams look at him as a guy who could potentially help in the middle of their order.
The Mariners acquired Morales from the Angels this past offseason for starting pitcher Jason Vargas, when the team had plans of trying to contend this season. It appears as though the last hurdle between the Mariners and selling is the team itself, as they have been rebuilding for a while now and jobs could be on the line.
The article does not mention specific teams, but the market for Morales should be strong as there are not many bats on the market at this point.
If the Mariners do decided to sell, the team could also look to move the rejuvenated Raul Ibanez, along with some of their flame-throwing relievers.