Colon's agent, Joe Linta, said Tuesday that Dr. James Bradley will perform the surgery Wednesday. Linta called Colon's injury a "classic torn Achilles," with a recovery time of 9 to 12 months.
Colon, 27, is eligible to become a free agent after the 2010 season, and Linta said his client would be open to staying in Pittsburgh.
"Based on my conversation with Dr. Bradley, this is a routine Achilles surgery and will not impact Willie's future as a player," Linta said. "There is no reason he will not have a 100 percent recovery, and this shouldn't impact his ability to generate a contract. He'd have to pass a physical, but his recovery time will put him on schedule to do that."
The Steelers had free-agent tackle Flozell Adams in for a visit Tuesday and could sign him as a stopgap replacement for Colon in 2010. Adams made five Pro Bowls in 12 seasons with the Dallas Cowboys, who released him this offseason.
Steelers rookie offensive tackle Chris Scott, a fifth-round draft pick, also will have surgery Wednesday, the team announced, to repair a right foot injury that occurred while he was training in Tennessee.
The Associated Press contributed to this report.