Shaun Williams was notified about his new role at the end of last season - and can't wait to get going.
The 33-year-old Irishman will join Gary Rowett's backroom staff in a player/coach capacity for the 2020/21 season, and the midfielder told millwallfc.co.uk how the step up came about.
"I'm buzzing," he said. "The gaffer told me about it towards the end of last season and then contacted me last week to see if I was still interested. It was an opportunity I couldn't really turn down - hopefully it will help me gain experience and stand me in good stead in the long run.
"I've always wanted to stay in the game and I really enjoy coaching. I've got some of my badges, and hopefully I can continue learning every day here."
Like his team-mates, Williams returned to pre-season training on Thursday after just three weeks away - but in contrast to the usual off-season period, the midfielder explained how he preferred the smaller break.
"I have two young boys, so rest doesn't really come about in my house, but it was nice - we got to see our families.
"I think three weeks is about enough, usually we get longer but then you get itchy feet and want to come back. We had two weeks to ourselves and then had a week in which we had to do an off-season programme."
Next up is a training camp in Scotland, and on that, Williams added: "It's more of a bonding session and getting some hard work in. It also settles the new lads down, takes the edge off meeting new people, and is a valuable exercise."