Parnell, who had herniated disc surgery last summer, threw 10 pitches from a mound on Friday.
Speaking of Parnell, reliever Jose Valverde says he understands Parnell is the team's closer.
“I’m here because I want to support the team,” Valverde said Sunday (New York Post, Feb. 16). “If one of the other guys is the closer, that’s fine with me. I want to do my job and support the team.”
Valverde has 286 career saves spanning 11 years with the D-Backs, Astros and Tigers.