Batista is the Mets' long man out of the bullpen but has made four starts this season. In those starts, he is 1-1 with a 4.00 ERA over 18 innings. Harvey, the Mets' No. 2 prospect, is pitching for Triple-A Buffalo. He is 7-4 with a 3.39 ERA and has struck out 102 batters in 98 1/3 innings
Harvey will start for Buffalo on Monday, and he will be closely watched by the Mets.
"Monday night, we might get the reports back [saying] he's the guy, he's ready," Collins said.
Collins also did not rule out the possibility of right-hander Zach Wheeler, the Mets' top prospect, being called up to the Major Leagues this season.
"I've heard wonderful, wonderful things about him," Collins said. "Getting better, getting better, getting better. He's not out of the mix."
Wheeler, who was acquired in the Carlos Beltran trade, is 8-4 with a 2.62 ERA at Double-A Binghamton this season, and he may be in line for a promotion to Triple-A soon.