Colon, who didn't miss a game the previous three seasons, likely will have season-ending surgery Wednesday. He injured the Achilles' tendon during a Monday workout and left the Steelers' facility on crutches.
Colon had an MRI on Monday, and the Steelers likely will make an announcement about those results Tuesday. The injury recovery time is at least five to six months, and the Steelers plan to place Colon on season-ending injured reserve, according to the source.
The Steelers' depth at tackle is limited behind Colon and could affect their plans to emphasize the running game next season.
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