Tulowitzki traveled to Philadelphia on Wednesday to meet with the same doctor who performed surgery on his groin on June 21 -- the shortstop has been out since May 30 with the injury. A positive report and a healthy feeling Tulowitzki gave the green light to begin the assignment on Friday.
"It's been a long process and it's been frustrating," Tulowitzki said of his recovery. "I've watched a lot of games that we haven't played particularly well, but I've also seen a lot of positives. I've seen a lot of young guys on the field that have played real well and I'm excited to get on the field with them."
Tulowitzki is scheduled to play five innings on Friday, followed by a day off to ease him back into everyday play.
"It's going to be mixed emotions for me when I get out there playing," he said. "I'll be nervous, I'll be excited, but I just want to get through a game to prove I can do everything and we'll take it from there."
Giambi, meanwhile, will play a complete game on Friday as DH. He has been on the disabled list since July 24 with a viral infection.