Also, Red Sox manager Jimy Williams said the team will activate Ramon Martinez from the 60-day disabled list to start on Thursday against Kansas City.
Saberhagen, 35, is 9-5 with a 3.36 ERA this season. The two-time Cy Young Award winner missed most of 1996-97 after unrelated surgery on his right shoulder.
Martinez, the older brother of Red Sox ace Pedro Martinez, has missed the entire season after right shoulder surgery. He has a 123-77 record and 3.45 ERA in parts of 11 seasons with the Los Angeles Dodgers.
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