Tommie Harris sat out Chicago's practice on Monday and also revealed one reason why he remains a little more fragile coming out of this offseason. "This is just rest," Harris said. "I had surgery [in] March, so I didn't get a chance to do a lot of the staff that the teammates were doing. So they're far ahead of me. I'm really just starting to catch up." He admitted to being a tad frustrated by not being able to do more on-field work. Harris has been limited in practices since suffering a Grade II MCL tear in his left knee during Week 3 of the 2007 campaign. He played through the injury without missing any games that season, then was rewarded with a four-year, $40 million contract extension. Harris had his knee scoped by famed orthopedic surgeon James Andrews before the '08 season. His latest surgery was not performed by Andrews.