Toscano, 25, is seeking a Major League deal. Because he played five seasons in Cuba's Serie Nacional, he would not count against Atlanta's international signing bonus allotment.
While it appeared the Braves and Toscano were nearing a deal on Monday, multiple industry sources indicated the two parties were still negotiating the financial structure of the contract offer.
Toscano is a left-handed contact hitter who would likely need to gain some Minor League seasoning before making the jump to the Majors. He has not been seen by many scouts because he never played in international events for the Cuban national team.
Mark Bowman is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.