Gagne must waive his no-trade clause to Boston for the deal to be completed. It is possible the Red Sox will allow him to share the closer’s role with Jonathan Papelbon.
The Rangers would receive left-hander Kason Gabbard and an additional player or players in the deal, sources say.
Before reaching agreement with the Red Sox, the Rangers had discussed trading Gagne to the Mets, Yankees and Brewers. He could have been sent to each of those teams without his permission.
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