Franco is ranked by MLB.com as the No. 3 prospect in the Phillies' system.
Franco hit .308 with seven home runs, 24 RBIs and an .883 OPS for Triple-A Lehigh Valley in August. He hit safely in 21 of the 29 games he played in the month and compiled 11 multihit games.
Whitehead, meanwhile, went 2-1 with a 0.67 ERA in five August appearances. He tallied 17 strikeouts without allowing a walk in his 27 innings of work. Opponents hit just .234 (25-for-107) against the 6-foot-4 righty.
Erik Bacharach is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.