Mick Harford has been appointed assistant manager to Steve Lomas at Millwall.
The 54-year-old former striker turned down a role with Newcastle United to join the Championship club.
"I'm delighted that Mick has joined us," Lomas told Millwall's official website. "He's a vastly experienced coach who I have known for many years now."
Meanwhile, Tim Breacker has been installed as first-team coach at The Den.