Danny Shittu has signed a new two-year contract with Millwall that will take him through 2015.
The defender’s current deal was due to expire next month, but the club and their 32-year-old Nigerian captain agreed to a new contract.
Shittu, who captained the Lions for most of the current season, was delighted to stay on at the Den.
“There have been a couple months of talks and I'm delighted to have got it done,” he told the club website.
“We have had a lot of ups and for me to be staying here shows that I believe in this club and I believe a lot can come from it.”
Leeds forward El-Hadji Diouf has been fined two weeks' wages for his red card in Saturday's 2-1 defeat to Brighton.
The Senegalese striker was sent off for making an offensive gesture at Brighton fans after he scored a penalty.
Leeds boss Brian McDermott told the club's official website: "I've spoken to El-Hadji Diouf and he has apologised regarding the sending off on Saturday.
"He has accepted the sending off and the club have fined him two weeks' wages which is the maximum we can do.
Millwall have underlined their determination to keep captain Danny Shittu by offering him a two-year contract.
The Lions initially offered the 32-year-old a 12-month deal when discussions began last month, but in a show of goodwill they have agreed to Shittu's request for longer terms.
Many had speculated that the two parties were deadlocked over the length of the centre-back's new contract - but it is believed a two-year offer has been on the table for several weeks, according to News at Den.
Bulky central defender Shittu has been an immense figure for Millwall this term and, despite his advancing years, manager Kenny Jackett was quick to sanction a revision of the club's first proposal.