Shaun Williams has committed his future to Millwall by signing a new contract with the club.
The Irish midfielder put pen-to-paper on a new one-year deal on Tuesday afternoon, with an option for an additional 12 months.
"I'm really over the moon," Williams told millwallfc.co.uk
"Having such success last season made it an easy decision for me to sign another contract. I'm delighted to finally get it all sorted out.
"I have been here for three-and-a-half years and have had a lot of ups and downs - but I've loved every minute of my time here."
Williams was pivotal in helping the club secure promotion to the Sky Bet Championship and says he "really can't wait" for the challenge that awaits The Lions in the second tier of English football.
"It's a whole new ball game for us," the 30-year-old added.
"You look at the teams, the budgets and the players that are in the division and it will be a different beast next season.
"Hopefully we can hold our own and do the club proud."