Kings defenseman Mitchell in 'holding pattern'

Los Angeles Kings defenseman Willie Mitchell had another medical procedure on his injured knee Tuesday, and his return to the lineup remains unknown, general manager Dean Lombardi said.

"We're still in the same holding pattern," Lombardi said. "There's really no timetable."

Mitchell has not played this season.

Lombardi said defenseman Alec Martinez is on schedule in his 2-4-week return from an upper-body injury sustained in mid-February, and defenseman Matt Greene is ahead of schedule in his return from a projected three-month back injury suffered in January.