Texans wide receiver Andre Johnson is expected to miss three weeks after undergoing a minor medical procedure Tuesday, according to a report. The report, which cited league sources, said Johnson had the procedure to "eliminate scar tissue to speed up the healing process related to his right hamstring." Johnson went down without getting touched in the second quarter against Pittsburgh on Sunday, and did not return. "You don't replace Andre," coach Gary Kubiak said. "What you do is you've got to pick it up across the board, at other spots."