NEIL Harris has confirmed that he and assistant Dave Livermore are using Steve Coppell as a "sounding board" for their ideas.
But Harris says Coppell's involvement at the club is very informal at this stage and revealed that he's been canvassing several other experienced figures for opinions and advice.
Kenny Jackett and Sean Dyche have offered to help in recent weeks, while AFC Wimbledon's Neal Ardley, a former teammate of Harris, has also been a valuable resource.
Coppell is being considered for an advisory role should Harris be appointed permanently – but the interim Lions boss says that will be discussed "further down the line".
He said: "Livers and I have a lot of knowledge about this club and what a Millwall team and player requires but where we fall short is our years of experience on the touchline.
"We ummed and ahhed with the board about bringing somebody in with experience and we're still playing that by ear. There's no pressure for any of us to do anything.
"Steve was recommended by a friend. He's worked with Richie Barker before at Crawley and he loves football.
"He's not an employee of the club – he's a football man with almost unlimited knowledge of the game.
"If at any stage we wanted to speak, then Steve's at the other end of the phone.
"I've already spoken to Steve, he's a great guy and his knowledge is ridiculous – he knows everybody and everything."
Coppell was seated in the directors' box during Millwall's win over Charlton.
"He goes to a couple of games every week and was planning to come to our game anyway, but he is someone I've leant on for advice in the last couple of weeks," Harris added.
"That's all it is at the moment and if that were to change, that would come further down the line.
"If I want to pick someone's brain, Steve is a contact within the game. If me and Livers want someone to chew the fat with, then there's somebody there. Steve is a friendly face.
"I've also been speaking to people that I played under and played with because it's good to have that sounding board and a different voice at the end of the phone.
"It can help you re-confirm your own thoughts or get a little bit of advice. It's really important. I'm speaking to managers quite a lot.
"I spoke to Neal Ardley last week about Jake Goodman but I played with Neal and he's a great guy, so I picked his brain because I trust his opinion.
"Football is a big, wide world but there are good people out there who want to help and share advice."