Neil Harris has stated his delight at tying down Shaun Williams to a new contract at The Den.
The midfielder, who has made 155 appearances for The Lions since joining from MK Dons in January 2014, has signed a new one-year deal in SE16, with the option for a further year available.
"I'm delighted - Willo has been immense for us," Harris told millwallfc.co.uk.
"When I took over, I changed the style of play from a possession based team to a slightly more direct style of play, a more Millwall team with a lot of second ball regains and a lot of higher pressure. It took Shaun a while to adapt to that, but his ability is there to be seen. He has adapted his natural game to fit into our team and that is the measure of the man - a real team player.
"His performances this last year have been really consistent and arguably he was one of our best players during the course of the season. I'm delighted to tie him down. He has Championship experience and he is a good leader within our group."
In signing a contract, Williams will rejoin his midfield partners when pre-season training begins in late June. Harris explained how competition for places will be as important as ever now that Millwall have made the significant step up to The Championship.
"It's important to have competition for places. There's going to be a need to adjust in certain games next season - a need to adjust from our style of play that has served us well for two years. We won't come too far away from the ethos of what I believe in, but we will have to be versatile and Shaun gives us that. Whether it's in a two-man or three-man midfield, or at centre-half, there's plenty there to work with."
"He's complemented Ben [Thompson], Jimmy [Abdou] and Calum [Butcher] with his performances over the last season, so it was important to keep him here. In stepping up a level, you need good players that will cope with being under pressure week in, week out. If they aren't, then they know they've got people breathing down their neck."