Saints' Meachem to have surgery, miss 3-4 weeks

Saints first-round draft pick Robert Meachem will undergo arthroscopic surgery on his knee Tuesday morning and will be out 3-4 weeks, sources told ESPN.com's Matt Mosley on Monday.

Earlier in the day, the Saints said the wide receiver had to have his right knee examined for a potential
medial meniscus problem after he missed practices Sunday and

Head coach Sean Payton said after Monday's practice that the
Saints knew about a possible minor meniscus problem before they
drafted the former standout receiver out of Tennessee with the 27th pick overall.

"We backed him off yesterday and the same
way this morning," Payton said.

Meachem also missed portions of rookie camp the weekend after
the draft when he sprained his left ankle.

Matt Mosley covers the NFL for ESPN.com. The Associated Press contributed to this report.