The Phillies recalled McFarlane from Double-A Reading on Friday.
McFarlane has moved to the bullpen this season with Reading and posted a 1.42 ERA and 10:4 K:BB over his first 6.1 innings. The hard-throwing right-hander will provide manager Rob Thomson with a fresh bullpen arm, and while he has the upside to eventually work late innings, the 24-year-old will likely be used in lower-leverage spots initially.