In eight games, Alcantara was 8-for-39 batting first. He was needed there because Chris Coghlan has been batting a sore left big toe.
Another option was Matt Szczur, who called up to the big leagues on Sunday. Szczur made his first start on Monday at Citi Field.
"We've been talking about getting [Alcantara] back into that slot because we want him to get comfortable there because in the end, we see him as a potential leadoff guy," Renteria said. "He's got a history of getting on base. There are a lot of qualities that allow you to view him as a potential leadoff candidate."
Alcantara actually has been having a tough time in the No. 6 spot in the lineup as big league pitchers continue to throw the rookie more offspeed pitches. He was batting .206 in 16 games this month.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.