PHILADELPHIA - As the postseason looms, the back end of the Mets' bullpen could be in for a slight reshuffling.

Manager Terry Collins left open the possibility of switching up his setup men, with Addison Reed potentially seeing action in the eighth inning over Tyler Clippard, who has filled the role since arriving in late July via a trade with the A's.

"We've talked about that," Collins said. "Depending on who's up in the seventh inning, we might reverse it. But I like the back end."

Clippard has a 7.71 ERA in 112/3 innings in his last 11 appearances, a stretch in which he has allowed opponents to hit .298.

Reed, acquired in a trade with the Diamondbacks, has yet to allow an earned run in 15 appearances (14 innings) with the Mets, though he has allowed five of six inherited runners to score.

The Mets traded for Reed to slot him in the seventh inning, thus forming a back-end triumvirate with Clippard and closer Jeurys Familia.

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Meanwhile, Jonathon Niese's transition from starter to reliever has gone well enough to bolster his chances of making the postseason roster.

Niese appeared in back-to-back games for the first time in his big-league career. He allowed a run in 12/3 innings on Tuesday night and backed up that effort with a scoreless third of an inning Wednesday night.

"A couple of things he did that I really liked is that he can get ready in a hurry and he came in throwing strikes," Collins said of Niese, who did not issue a walk.

The Mets have until 10 a.m. of the day of the opening game of the NLDS to set their postseason roster. Collins said debate remains about how many bullpen arms to carry.

A year ago, the Giants and Nationals needed 18 innings to decide an NLDS game. Collins said taking seven relievers would protect the Mets in such a scenario. But the Mets also could devote the roster spot to another position player.