Nieuwenhuis, who finished 1 for 3 with a walk, came into Sunday's game batting .077 (1 for 13) in six games (three starts) since his recall from Triple-A Las Vegas.

"I don't think we need to do a straight platoon," Collins said, per ESPN. "There might even be a time when they're both out there at the same time. That's certainly the reason why Juan is still here. We're getting to the stages where we've got to start taking a look down the road. So there certainly could be that time when they're both out there. But I think you want to pick your spots -- not to put Juan over his head or Nieuwy over his head against somebody you're just not going to be able to hit." 

Nieuwenhuis was demoted to the minors in late April following a slow start offensively. However, he found his stroke at Triple-A Las Vegas and homered eight times in his last 16 games prior to Sunday's recall. Nieuwenhuis credited Las Vegas manager Wally Backman and hitting coach George Greer for his turnaround.

"Wally and George have done a great job with helping me out, for sure," Nieuwenhuis said, per ESPN. "I owe a lot to them. They straightened me out and helped me out a lot. I was kind of lost when I came down here, not having at-bats in spring training. I was kind of in a funk, and they really helped me out. They really put a lot of effort into it." 

Nieuwenhuis is hitting .232 for Las Vegas, but has three home runs in the last 10 games.  

Collins said Nieuwenhuis' recent surge has put him back on the radar for a potential recall.