Frazier (thumb) took live batting practice against Pirates right-hander Mitch Keller during Wednesday's full-squad workout, Noah Hiles of the Pittsburgh Post-Gazette reports.
The Pirates signed Frazier to a one-year, $1.525 million contract Tuesday, Mark Feinsand of MLB.com reports.
Frazier will undergo surgery on his right thumb this week, Anne Rogers of MLB.com reports.
Frazier is absent from Sunday's lineup against Atlanta.
Frazier is not in the lineup for Friday's contest in Atlanta.
Frazier is out of the lineup for Thursday's game against the Nationals.
Frazier is out of the lineup for Wednesday's game against the Nationals.
Frazier is out of the lineup for Sunday's game against the Giants.
Frazier is absent from the lineup for Wednesday's contest against the Tigers.
Frazier will start at third base and bat seventh in Monday's game against the Tigers.