PAWTUCKET -- Justin Masterson was originally scheduled to make his Triple-A debut on Saturday in Durham. But now the Red Sox pitching prospect will start for Pawtucket on Thursday at McCoy Stadium, perhaps as preparation for another appearance in Boston next week.

Daisuke Matsuzaka had to leave Tuesday's game in Seattle because of shoulder fatigue, and both Matsuzaka and manager Terry Francona said they were unsure if Dice-K would be able to make his next scheduled start. By moving up Masterson's start, it would put him in line to pitch Tuesday, which -- because of Thursday's off day -- could be Matsuzaka's next turn in the rotation. Tim Wakefield, who is pitching tonight for the Sox in Seattle, could work Monday in Baltimore -- Matsuzaka's actual day to pitch -- on normal rest because of the off day.

Clay Buchholz, who is in Pawtucket on rehab assignment, will pitch Friday in Durham and thus would be unable to work either Monday or Tuesday.

If the Red Sox do, in fact, place Matsuzaka on the disabled list, don't be surprised if the club recalls hot-hitting Jeff Bailey from Pawtucket, especially since Kevin Youkilis has been hampered with a sore right hand. Bailey could help the Sox this weekend then sent back to Pawtucket once a pitcher (Masterson) is needed early next week.