Heyman notes that the Dodgers and Angels are looking for starting pitching help.
Most players are passed through revocable waivers during this month. If they are claimed by another team, their current team can either pull them back or work out a deal. If a player passes through waivers unclaimed, as Niese and Granderson have, their current team can freely trade them to any other team.
Niese is 5-8 with a 3.46 ERA this season. He is due $7 million next season and $9 million in 2016.
Granderson is hitting .232 with 15 home runs and 46 RBI this year. He is due to make $16 million in each of the next two seasons and $15 million in 2017.
Last season, the Mets were able to trade John Buck and Marlon Byrd to the Pirates in late August, after both cleared waivers, in return for Vic Black and top prospect Dilson Herrera.