Panthers lineman Amini Silatolu tears meniscus in practice

SPARTANBURG, S.C. -- Carolina Panthers coach Ron Rivera said after Tuesday's practice that depth on the offensive line wouldn't be a concern unless the injury news on left guard Amini Silatolu came back bad.

It's time to be concerned.

The Panthers lost their second starting lineman since training camp began after doctors in Charlotte, North Carolina revealed Silatolu suffered a torn meniscus in his left knee. He will have surgery on Friday and his return will be evaluated week to week.

Undrafted rookie Brendan Mahon out of Penn State will start Thursday night's preseason opener at Buffalo at what was a critical spot for the Panthers entering camp as they attempted to replace All Pro Andrew…