Central midfielder Nadjim Abdou has joined Millwall from Plymouth Argyle on a two-year deal.
Abdou, who is known as 'Jimmy', left Home Park after failing to agree terms with the Championship side.
The 23-year-old is Kenny Jackett's third summer signing after keeper David Forde and striker Ashley Grimes.
"Jimmy is on the way up. He is a player with a bit of everything, including a real strength in his tackling," Jackett told the club website.
"He gained good experience in the Championship last year and the fact that he has a real hunger and desire to be successful was a big attraction for me," he added.
Abdou began his career in France before signing for Ian Holloway on a free transfer in August 2007.
He made 33 appearances for the Pilgrims last season and scored two goals.
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